build(deps): bump pantsbuild/actions from 7 to 8

Bumps [pantsbuild/actions](https://github.com/pantsbuild/actions) from 7 to 8.
- [Release notes](https://github.com/pantsbuild/actions/releases)
- [Commits](pantsbuild/actions@v7...v8)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/pants.yaml

@@ -44,7 +44,7 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
-    - uses: pantsbuild/actions/init-pants@v7
+    - uses: pantsbuild/actions/init-pants@v8
       with:
         pants-python-version: ${{ matrix.python-version }}
         gha-cache-key: cache0-py${{ matrix.python-version }}