github-actions: bump actions/cache from 3 to 4 (#774)

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

.github/workflows/build.yml

@@ -66,7 +66,7 @@ jobs:
       run: git -C third_party/silabs/gecko_sdk lfs ls-files -l | cut -d' ' -f1 | sort > .lfs-assets-id
 
     - name: Restore gecko_sdk LFS cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       id: lfs-cache
       with:
           path: .git/modules/third_party/silabs/gecko_sdk/lfs

.github/workflows/docker.yml

@@ -66,7 +66,7 @@ jobs:
       run: git -C third_party/silabs/gecko_sdk lfs ls-files -l | cut -d' ' -f1 | sort > .lfs-assets-id
 
     - name: Restore gecko_sdk LFS cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       id: lfs-cache
       with:
           path: .git/modules/third_party/silabs/gecko_sdk/lfs