[actions] update setup-go

Author: capcom6

.github/workflows/pr.yml

@@ -21,7 +21,7 @@ jobs:
 
       # step 2: set up go
       - name: Set up Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: stable
           cache-dependency-path: test/e2e/go.sum