Bumps [ajv](https://github.com/ajv-validator/ajv) from 6.10.0 to 6.12.6.
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](ajv-validator/ajv@v6.10.0...v6.12.6)

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Bumps [async](https://github.com/caolan/async) from 2.6.2 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@v2.6.2...v2.6.4)

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Bumps [json-schema](https://github.com/kriszyp/json-schema) and [jsprim](https://github.com/joyent/node-jsprim). These dependencies needed to be updated together.

Updates `json-schema` from 0.2.3 to 0.4.0
- [Release notes](https://github.com/kriszyp/json-schema/releases)
- [Commits](kriszyp/json-schema@v0.2.3...v0.4.0)

Updates `jsprim` from 1.4.1 to 1.4.2
- [Release notes](https://github.com/joyent/node-jsprim/releases)
- [Changelog](https://github.com/TritonDataCenter/node-jsprim/blob/v1.4.2/CHANGES.md)
- [Commits](TritonDataCenter/node-jsprim@v1.4.1...v1.4.2)

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Bumps [minimist](https://github.com/minimistjs/minimist), [mkdirp](https://github.com/isaacs/node-mkdirp) and [handlebars](https://github.com/wycats/handlebars.js). These dependencies needed to be updated together.

Updates `minimist` from 1.2.0 to 1.2.7
- [Release notes](https://github.com/minimistjs/minimist/releases)
- [Changelog](https://github.com/minimistjs/minimist/blob/main/CHANGELOG.md)
- [Commits](minimistjs/minimist@v1.2.0...v1.2.7)

Updates `mkdirp` from 0.5.1 to 0.5.6
- [Release notes](https://github.com/isaacs/node-mkdirp/releases)
- [Changelog](https://github.com/isaacs/node-mkdirp/blob/main/CHANGELOG.md)
- [Commits](isaacs/node-mkdirp@0.5.1...v0.5.6)

Updates `handlebars` from 4.1.2 to 4.7.7
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/handlebars-lang/handlebars.js/blob/master/release-notes.md)
- [Commits](handlebars-lang/handlebars.js@v4.1.2...v4.7.7)

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Bumps [minimatch](https://github.com/isaacs/minimatch) from 3.0.4 to 3.0.8.
- [Release notes](https://github.com/isaacs/minimatch/releases)
- [Commits](isaacs/minimatch@v3.0.4...v3.0.8)

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Bumps [qs](https://github.com/ljharb/qs) from 6.5.2 to 6.5.3.
- [Release notes](https://github.com/ljharb/qs/releases)
- [Changelog](https://github.com/ljharb/qs/blob/main/CHANGELOG.md)
- [Commits](ljharb/qs@v6.5.2...v6.5.3)

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Bumps [ejs](https://github.com/mde/ejs) to 3.1.8 and updates ancestor dependency [grunt-contrib-nodeunit](https://github.com/gruntjs/grunt-contrib-nodeunit). These dependencies need to be updated together.


Updates `ejs` from 2.6.1 to 3.1.8
- [Release notes](https://github.com/mde/ejs/releases)
- [Changelog](https://github.com/mde/ejs/blob/main/CHANGELOG.md)
- [Commits](mde/ejs@v2.6.1...v3.1.8)

Updates `grunt-contrib-nodeunit` from 2.0.0 to 4.0.0
- [Release notes](https://github.com/gruntjs/grunt-contrib-nodeunit/releases)
- [Changelog](https://github.com/gruntjs/grunt-contrib-nodeunit/blob/main/CHANGELOG)
- [Commits](gruntjs/grunt-contrib-nodeunit@v2.0.0...v4.0.0)

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Removes [shelljs](https://github.com/shelljs/shelljs). It's no longer used after updating ancestor dependency [grunt-contrib-jshint](https://github.com/gruntjs/grunt-contrib-jshint). These dependencies need to be updated together.


Removes `shelljs`

Updates `grunt-contrib-jshint` from 2.1.0 to 3.2.0
- [Release notes](https://github.com/gruntjs/grunt-contrib-jshint/releases)
- [Changelog](https://github.com/gruntjs/grunt-contrib-jshint/blob/main/CHANGELOG)
- [Commits](gruntjs/grunt-contrib-jshint@v2.1.0...v3.2.0)

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Bumps [y18n](https://github.com/yargs/y18n) from 4.0.0 to 4.0.3.
- [Release notes](https://github.com/yargs/y18n/releases)
- [Changelog](https://github.com/yargs/y18n/blob/y18n-v4.0.3/CHANGELOG.md)
- [Commits](yargs/y18n@v4.0.0...y18n-v4.0.3)

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tz.guess() works by checking offsets starting with <currentYear - 2>.
Some zones had their last transition in 2020, which is now outside
the range of guesses, so their guess answers changed.

It's 2023 now, these files are producing incorrect results for
the current year.

Moment Timezone still works with core Moment 2.9.0 and above. But security
auditing tools are continually complaining about old versions being brought in
via package managers. Bumping the dependency to the latest version should at
least silence the warnings, even if it's not semantically correct.

Co-authored-by: Igor Omelchenko <a@megapixel23.com>