Bump actions/cache (#367)

Author: morganchen12

.github/workflows/test.yml

@@ -21,7 +21,7 @@ jobs:
           node-version: ${{ matrix.node-version }}
 
       - name: Cache npm
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         with:
           path: ~/.npm
           key: ${{ runner.os }}-node-${{ matrix.node-version }}-${{ hashFiles('**/package-lock.json') }}