Update actions/setup-go action to v6

Author: renovate[bot]

.github/workflows/test.yml

@@ -25,7 +25,7 @@ jobs:
     steps:
       - name: Install Go
         if: success()
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: ${{ matrix.go-version }}