ci(workflow): Hasten checkout with blobless clones

In v4.1.0, actions/checkout recently introduced support for Git's
partial clones. Partial clones are smaller than full clones
(`fetch-depth: 0`), because they don't clone historical blobs and/or
trees. In partial clones, Git operations will typically fetch data that
isn't available locally as needed. Hence, prefer blobless clones, the
partial clones that give the best performance overall, to full clones.

.github/workflows/test.yaml

@@ -17,6 +17,7 @@ jobs:
         uses: actions/[email protected]
         with:
           fetch-depth: 0
+          filter: blob:none
       - name: Use Docker in rootless mode.
         uses: ./
       - name: Run pre-commit hooks.