build(deps): bump actions/cache from 4 to 6

Bumps [actions/cache](https://github.com/actions/cache) from 4 to 6.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4...v6)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -73,22 +73,22 @@ jobs:
         run: echo "commit_hash=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT
 
       - name: Configure ccache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ${{ env.CCACHE_DIR }}
           key: ${{ runner.os }}-${{ github.job }}-ccache-${{ steps.ccache_cache_timestamp.outputs.timestamp }}
           restore-keys: ${{ runner.os }}-${{ github.job }}-ccache-
 
       - name: Configure Cppcheck Cache
         id: cppcheck_cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ${{ env.CPPCHECK_CACHE_PATH }}
           key: ${{ runner.os }}-${{ github.job }}-cppcheck-cache-${{ steps.prepare_cppcheck_cache_key.outputs.cppcheck_tag }}
 
       - name: Configure Geany Cache
         id: geany_cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ${{ env.GEANY_CACHE_PATH }}
           key: ${{ runner.os }}-${{ github.job }}-geany-cache-${{ steps.prepare_geany_cache_key.outputs.commit_hash }}
@@ -250,7 +250,7 @@ jobs:
 
       - name: Configure Geany Cache
         id: geany_cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ${{ env.GEANY_CACHE_PATH }}
           key: ${{ runner.os }}-${{ github.job }}-geany-mingw64-cache-${{ steps.prepare_geany_cache_key.outputs.commit_hash }}