update actions/cache version

Author: nmdefries

.github/workflows/ci.yaml

@@ -65,7 +65,7 @@ jobs:
           docker network create --driver bridge delphi-net
           docker run --rm -d -p 13306:3306 --network delphi-net --name delphi_database_epidata --cap-add=sys_nice delphi_database_epidata
           docker run --rm -d -p 6379:6379 --network delphi-net --env "REDIS_PASSWORD=1234" --name delphi_redis delphi_redis
-          
+
 
       - run: |
           wget https://raw.githubusercontent.com/eficode/wait-for/master/wait-for
@@ -103,7 +103,7 @@ jobs:
         with:
           node-version: '16.x'
       - name: Cache Node.js modules
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.npm # npm cache files are stored in `~/.npm` on Linux/macOS
           key: ${{ runner.OS }}-node2-${{ hashFiles('**/package-lock.json') }}