Bump actions/cache from 2 to 3

Bumps [actions/cache](https://github.com/actions/cache) from 2 to 3.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](https://github.com/actions/cache/compare/v2...v3)

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

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

.github/workflows/static.yml

@@ -23,7 +23,7 @@ jobs:
 
     - name: Cache validator
       id: validator-cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: vnu-runtime-image
         key: ${{ runner.os }}-validator-${{ env.VALIDATOR_VERSION }}