Bump the github-actions group across 1 directory with 5 updates (#513)

Bumps the github-actions group with 5 updates in the / directory:

| Package | From | To |
| --- | --- | --- |
| [actions/cache](https://github.com/actions/cache) | `4.2.2` | `4.3.0` |
| [actions/checkout](https://github.com/actions/checkout) | `4.2.2` | `5.0.0` |
| [subosito/flutter-action](https://github.com/subosito/flutter-action) | `2.18.0` | `2.21.0` |
| [codecov/codecov-action](https://github.com/codecov/codecov-action) | `5.4.0` | `5.5.1` |
| [actions/stale](https://github.com/actions/stale) | `9.1.0` | `10.0.0` |



Updates `actions/cache` from 4.2.2 to 4.3.0
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@d4323d4...0057852)

Updates `actions/checkout` from 4.2.2 to 5.0.0
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@11bd719...08c6903)

Updates `subosito/flutter-action` from 2.18.0 to 2.21.0
- [Release notes](https://github.com/subosito/flutter-action/releases)
- [Commits](subosito/flutter-action@f2c4f66...fd55f4c)

Updates `codecov/codecov-action` from 5.4.0 to 5.5.1
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@0565863...5a10915)

Updates `actions/stale` from 9.1.0 to 10.0.0
- [Release notes](https://github.com/actions/stale/releases)
- [Changelog](https://github.com/actions/stale/blob/main/CHANGELOG.md)
- [Commits](actions/stale@5bef64f...3a9db7e)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: 4.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
- dependency-name: actions/checkout
  dependency-version: 5.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
- dependency-name: subosito/flutter-action
  dependency-version: 2.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
- dependency-name: codecov/codecov-action
  dependency-version: 5.5.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
- dependency-name: actions/stale
  dependency-version: 10.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]