Update cache action version

.github/workflows/build.yml

@@ -58,7 +58,7 @@ jobs:
         run: |
           echo "::set-output name=dir::$(npm config get cache)"
       - name: Cache NPM packages
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         id: npm-cache # use this to check for `cache-hit` ==> if: steps.npm-cache.outputs.cache-hit != 'true'
         with:
           path: ${{ steps.npm-cache-dir.outputs.dir }}