build(deps): bump mozilla-actions/sccache-action from 0.0.3 to 0.0.4

Bumps [mozilla-actions/sccache-action](https://github.com/mozilla-actions/sccache-action) from 0.0.3 to 0.0.4.
- [Release notes](https://github.com/mozilla-actions/sccache-action/releases)
- [Commits](https://github.com/mozilla-actions/sccache-action/compare/v0.0.3...v0.0.4)

---
updated-dependencies:
- dependency-name: mozilla-actions/sccache-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/docs.yaml

@@ -28,7 +28,7 @@ jobs:
           rustup default stable
 
       - name: Setup sccache
-        uses: mozilla-actions/sccache-action@v0.0.3
+        uses: mozilla-actions/sccache-action@v0.0.4
 
       - name: Setup mdBook
         uses: peaceiris/actions-mdbook@v1.2.0