Bump actions/checkout from 5 to 6 (#5)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/pythonkafkaclient.yml

@@ -62,7 +62,7 @@ jobs:
           REPO_RELEASE=${{ steps.pythonKafkaClientRelease.outputs.release }}
           echo "RELEASE_VERSION=${REPO_RELEASE}" >> $GITHUB_ENV
       - name: 'Check out repository from latest tag'
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ env.RELEASE_VERSION }}
           fetch-depth: 0