Bump buildpacks/github-actions from 5.5.4 to 5.6.0 (#819)

Bumps [buildpacks/github-actions](https://github.com/buildpacks/github-actions) from 5.5.4 to 5.6.0.
- [Release notes](https://github.com/buildpacks/github-actions/releases)
- [Commits](buildpacks/github-actions@v5.5.4...v5.6.0)

---
updated-dependencies:
- dependency-name: buildpacks/github-actions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/ci.yml

@@ -62,7 +62,7 @@ jobs:
       - name: Rust Cache
         uses: Swatinem/rust-cache@v2.7.3
       - name: Install Pack CLI
-        uses: buildpacks/github-actions/setup-pack@v5.5.4
+        uses: buildpacks/github-actions/setup-pack@v5.6.0
       - name: Run integration tests
         # Runs only tests annotated with the `ignore` attribute (which in this repo, are the integration tests).
         run: cargo test -- --ignored