chore(deps): update actions/cache action to v4

Author: renovate[bot]

.github/workflows/github-stats.yml

@@ -19,7 +19,7 @@ jobs:
         run: echo "::set-output name=dir::$(yarn cache dir)"
 
       - name: Get yarn cache
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         id: yarn-cache
         with:
           path: ${{ steps.yarn-cache-dir-path.outputs.dir }}