Bump actions/setup-python from 3 to 6

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 3 to 6.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](https://github.com/actions/setup-python/compare/v3...v6)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 5bc73a0..b16218b 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -35,7 +35,7 @@
         with:
           persist-credentials: false
           submodules: recursive
-      - uses: actions/setup-python@v3
+      - uses: actions/setup-python@v6
       - name: Get configuration and secrets from CloudTruth
         uses: ./.github/actions/cloudtruth/configure-action
         with: