Update actions/cache to latest version

Versions v1 and v2 have been deprecated.

Author: deuill

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
         go-version: ${{ matrix.go-version }}
 
     - name: Cache-Go
-      uses: actions/cache@v1
+      uses: actions/cache@v4
       with:
         path: |
             ~/go/pkg/mod              # Module download cache