update actions/cache to v4

Author: tballmsft

.github/workflows/makecode-release.yml

@@ -21,7 +21,7 @@ jobs:
               with:
                   node-version: ${{ matrix.node-version }}
             - name: Cache npm and makecode
-              uses: actions/cache@v2
+              uses: actions/cache@v4
               with:
                   path: |
                       ~/.npm

.github/workflows/makecode.yml

@@ -23,7 +23,7 @@ jobs:
               with:
                   node-version: ${{ matrix.node-version }}
             - name: Cache npm and makecode
-              uses: actions/cache@v2
+              uses: actions/cache@v4
               with:
                   path: |
                       ~/.npm