github/workflows: Bump actions/cache from 3 to 4.

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

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

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

Author: dependabot[bot]

.github/workflows/ports_esp32.yml

@@ -35,7 +35,7 @@ jobs:
 
     - name: Cached ESP-IDF install
       id: cache_esp_idf
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: |
           ./esp-idf/