Deps: Bump the dependencies group across 1 directory with 3 updates

Bumps the dependencies group with 3 updates in the /pr-conventional-commit-labeler directory: [httpx](https://github.com/encode/httpx), [ruff](https://github.com/astral-sh/ruff) and [tomli](https://github.com/hukkin/tomli).


Updates `httpx` from 0.27.2 to 0.28.0
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.27.2...0.28.0)

Updates `ruff` from 0.7.4 to 0.8.1
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.7.4...0.8.1)

Updates `tomli` from 2.1.0 to 2.2.1
- [Changelog](https://github.com/hukkin/tomli/blob/master/CHANGELOG.md)
- [Commits](hukkin/tomli@2.1.0...2.2.1)

---
updated-dependencies:
- dependency-name: httpx
  dependency-type: indirect
  update-type: version-update:semver-minor
  dependency-group: dependencies
- dependency-name: ruff
  dependency-type: indirect
  update-type: version-update:semver-minor
  dependency-group: dependencies
- dependency-name: tomli
  dependency-type: indirect
  update-type: version-update:semver-minor
  dependency-group: dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>