Update Go version and actions in workflow

Author: noxiouz

.github/workflows/go.yml

@@ -13,15 +13,17 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        go-version: [1.13.x, stable]
+        go-version: ['1.21.x', 'stable']
         os: [macos-latest, windows-latest, ubuntu-latest]
     steps:
-    - name: Set up Go
-      uses: actions/setup-go@v2
+    - name: Set up Go ${{ matrix.go-version }}
+      uses: actions/setup-go@v5
+      with:
+        go-version: ${{ matrix.go-version }}
       id: go
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v2
+      uses: actions/checkout@v5
 
     - name: Generate
       run: go generate cmd/varlink-go-certification/orgvarlinkcertification/generate.go