Update cache to latest major version

Updated actions/cache version to v6 for caching NPM dependencies.

Author: tdonohue

.github/workflows/build.yml

@@ -84,7 +84,7 @@ jobs:
         id: npm-cache-dir
         run: echo "dir=$(npm config get cache)" >> $GITHUB_OUTPUT
       - name: Cache NPM dependencies
-        uses: actions/cache@v6.1.0
+        uses: actions/cache@v6
         with:
           # Cache entire NPM cache directory (see previous step)
           path: ${{ steps.npm-cache-dir.outputs.dir }}