build(deps): bump the icu group with 4 updates

Bumps the icu group with 4 updates: [icu_experimental](https://github.com/unicode-org/icu4x), [icu_normalizer](https://github.com/unicode-org/icu4x), [icu_plurals](https://github.com/unicode-org/icu4x) and [icu_provider](https://github.com/unicode-org/icu4x).


Updates `icu_experimental` from 0.1.0 to 0.2.0
- [Release notes](https://github.com/unicode-org/icu4x/releases)
- [Changelog](https://github.com/unicode-org/icu4x/blob/main/CHANGELOG.md)
- [Commits](https://github.com/unicode-org/icu4x/compare/icu@0.1.0...icu@0.2.0)

Updates `icu_normalizer` from 1.5.0 to 2.0.0-beta1
- [Release notes](https://github.com/unicode-org/icu4x/releases)
- [Changelog](https://github.com/unicode-org/icu4x/blob/main/CHANGELOG.md)
- [Commits](https://github.com/unicode-org/icu4x/compare/icu@1.5.0...icu@2.0.0-beta1)

Updates `icu_plurals` from 1.5.0 to 2.0.0-beta1
- [Release notes](https://github.com/unicode-org/icu4x/releases)
- [Changelog](https://github.com/unicode-org/icu4x/blob/main/CHANGELOG.md)
- [Commits](https://github.com/unicode-org/icu4x/compare/icu@1.5.0...icu@2.0.0-beta1)

Updates `icu_provider` from 1.5.0 to 2.0.0-beta1
- [Release notes](https://github.com/unicode-org/icu4x/releases)
- [Changelog](https://github.com/unicode-org/icu4x/blob/main/CHANGELOG.md)
- [Commits](https://github.com/unicode-org/icu4x/compare/icu@1.5.0...icu@2.0.0-beta1)

---
updated-dependencies:
- dependency-name: icu_experimental
  dependency-version: 0.2.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: icu
- dependency-name: icu_normalizer
  dependency-version: 2.0.0-beta1
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: icu
- dependency-name: icu_plurals
  dependency-version: 2.0.0-beta1
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: icu
- dependency-name: icu_provider
  dependency-version: 2.0.0-beta1
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: icu
...

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Author: dependabot[bot]