Update dependency intl_translation to v0.21.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
intl_translation (source)	dev_dependencies	minor	0.20.0 → 0.21.0

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Release Notes

dart-lang/i18n (intl_translation)

v0.21.0

Compare Source

• BREAKING CHANGE: Update dart_style to ^3.0.0
  • Allow analyzer >=6.3.0 <8.0.0
  • Upgrade SDK constraint to ^3.9.0.

v0.20.1

Compare Source

• Add topics to pubspec.yaml
  • Update to dart_style 2.3.7. bin/make_examples_const.dartandrewrite_intl_messages.dartwill now look for a surrounding.dart_tool/package_config.json` file to infer the language version of the
    files updated by the script.
  • Upgrade dep on package:intl.

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Configuration

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: pubspec.lock

Command failed: flutter pub upgrade intl_translation
Because intl_translation >=0.21.0 depends on intl ^0.20.2 and fire_scribe depends on intl 0.19.0, intl_translation >=0.21.0 is forbidden.
So, because fire_scribe depends on intl_translation 0.21.0, version solving failed.
Failed to update packages.