Bump actions/cache from 4.0.0 to 4.0.2

Bumps [actions/cache](https://github.com/actions/cache) from 4.0.0 to 4.0.2.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4.0.0...v4.0.2)

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

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

.github/workflows/ci.yml

@@ -46,7 +46,7 @@ jobs:
           python-version: ${{ env.DEFAULT_PYTHON }}
       - name: Restore Python virtual environment
         id: cache-venv
-        uses: actions/[email protected].0
+        uses: actions/[email protected].2
         with:
           path: venv
           # yamllint disable-line rule:line-length
@@ -366,7 +366,7 @@ jobs:
           python-version: ${{ env.DEFAULT_PYTHON }}
           cache-key: ${{ needs.common.outputs.cache-key }}
       - name: Cache platformio
-        uses: actions/[email protected].0
+        uses: actions/[email protected].2
         with:
           path: ~/.platformio
           # yamllint disable-line rule:line-length