github/workflows/go: bump actions to v4

Author: frobware

.github/workflows/go.yml

@@ -14,10 +14,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Set up Go
-      uses: actions/setup-go@v3
+      uses: actions/setup-go@v4
       with:
         go-version: 1.19