Update GitHub Actions to fix deprecated actions/cache@v2

- Update actions/cache from v2 to v4
- Update actions/checkout from v2 to v4
- Update actions/setup-node from v1 to v4

Author: codejaeger

.github/workflows/main.yml

@@ -19,14 +19,14 @@ jobs:
         node-version: [ 16.x ]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
 
       - name: Cache node modules
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         env:
           cache-name: cache-node-modules
         with: