Bumps [grunt](https://github.com/gruntjs/grunt) from 1.4.1 to 1.5.2.
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/main/CHANGELOG)
- [Commits](gruntjs/grunt@v1.4.1...v1.5.2)

Closes gh-462

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updated-dependencies:
- dependency-name: grunt
  dependency-type: direct:development
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Bumps [async](https://github.com/caolan/async) from 2.6.3 to 2.6.4.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md)
- [Commits](caolan/async@v2.6.3...v2.6.4)

Closes gh-463

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  dependency-type: indirect
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Bumps [grunt](https://github.com/gruntjs/grunt) from 1.5.2 to 1.5.3.
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/main/CHANGELOG)
- [Commits](gruntjs/grunt@v1.5.2...v1.5.3)

Closes gh-464

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The test setup broke because of gh-450.

Tested on various setups locally.

Closes gh-466
Ref gh-450

The current logic has a few faults:
1. Tests fail on jQuery 4.0.0-pre as internal jQuery.cssNumber accesses are
triggering warnings.
2. Tests fail in IE because it doesn't support proxies and fallbacks haven't
been set properly.

We've only noticed those issues now, trying to run Migrate tests on TestSwarm
after a longer break when they weren't firing.

Closes gh-467

…space

Regex imp implementation takes `O(N^2)` time to trim the string when
multiple adjacent spaces were present.

The new expression require that the "whitespace run" starts from
a non-whitespace to avoid `O(N^2)` behavior when the engine would
try matching `\s+$` at each space position.

Closes gh-461
Ref jquery/jquery#5068

Migrating from AMD to ES modules in gh-343 made the `raw` testing mode break as
it relied on loading raw source files. This change removes the `raw` mode in
favor of the new `esmodules` one.

Setup is different than in jQuery as jQuery uses AMD to load tests and Migrate
just loads test files directly.

When Migrate is loaded via its source ES modules, test files are loaded as
modules as well. This is necessary as module scripts behave as if loaded with
the `defer` attribute so tests need to be deferred as well.

Iframe tests are skipped in `esmodules` mode as their setup is incompatible
with the above considerations.

In addition to the above, Karma tests now also run in esmodules mode for easier
verification this mode is not broken by PRs.

Closes gh-468
Ref gh-343

Closes gh-470

Bumps [socket.io-parser](https://github.com/socketio/socket.io-parser) from 4.0.4 to 4.0.5.
- [Release notes](https://github.com/socketio/socket.io-parser/releases)
- [Changelog](https://github.com/socketio/socket.io-parser/blob/main/CHANGELOG.md)
- [Commits](socketio/socket.io-parser@4.0.4...4.0.5)

Closes gh-476

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  dependency-type: indirect
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Bumps [engine.io](https://github.com/socketio/engine.io) and [socket.io](https://github.com/socketio/socket.io). These dependencies needed to be updated together.

Updates `engine.io` from 6.1.3 to 6.2.1
- [Release notes](https://github.com/socketio/engine.io/releases)
- [Changelog](https://github.com/socketio/engine.io/blob/main/CHANGELOG.md)
- [Commits](socketio/engine.io@6.1.3...6.2.1)

Updates `socket.io` from 4.4.1 to 4.5.3
- [Release notes](https://github.com/socketio/socket.io/releases)
- [Changelog](https://github.com/socketio/socket.io/blob/main/CHANGELOG.md)
- [Commits](socketio/socket.io@4.4.1...4.5.3)

Closes gh-477

---
updated-dependencies:
- dependency-name: engine.io
  dependency-type: indirect
- dependency-name: socket.io
  dependency-type: indirect
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Bumps [json5](https://github.com/json5/json5) from 1.0.1 to 1.0.2.
- [Release notes](https://github.com/json5/json5/releases)
- [Changelog](https://github.com/json5/json5/blob/main/CHANGELOG.md)
- [Commits](json5/json5@v1.0.1...v1.0.2)

Closes gh-478

---
updated-dependencies:
- dependency-name: json5
  dependency-type: indirect
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We can upgrade for Migrate 4.0. It's not worth spending time on figuring
out how to fix IE 9 with new UglifyJS at this point.

The `ie` option had to be renamed to `ie8` as the older version doesn't
support the former. In Migrate 4 we can remove it altogether.

Closes gh-479

Newer npm version support detecting the indent type of `package.json` and
follow it when updating the file. We already use tabs in the file so the
current override wasn't even respected.

Closes gh-480

Bumps [ua-parser-js](https://github.com/faisalman/ua-parser-js) from 0.7.31 to 0.7.33.
- [Release notes](https://github.com/faisalman/ua-parser-js/releases)
- [Changelog](https://github.com/faisalman/ua-parser-js/blob/master/changelog.md)
- [Commits](faisalman/ua-parser-js@0.7.31...0.7.33)

Closes gh-481

---
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Some frameworks, like AngularJS, invoke `removeAttr` on boolean attributes
but only after setting the respective property to `false`. Such usage is not
dangerous and would continue to work even after Migrate is removed. Therefore,
only warn for `removeAttr(booleanAttribute)` if the property wasn't `false`
already.

Fixes gh-471
Closes gh-484