ci: update main.yml

Author: MichaelCurrin

.github/workflows/main.yml

@@ -20,7 +20,7 @@ jobs:
           node-version: 16
 
       - name: Get cached dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.npm
           key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}