Upgrading cache version

Author: miguelpais

.github/workflows/ci-pull-request.yaml

@@ -52,7 +52,7 @@ jobs:
     - name: Check out code
       uses: actions/checkout@v2
     - name: Cache modules
-      uses: actions/cache@v1
+      uses: actions/cache@v4
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}