Update actions/setup-go action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -49,7 +49,7 @@ jobs:
 
     steps:
       - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: ${{ matrix.go-version }}
 
@@ -91,7 +91,7 @@ jobs:
           fetch-depth: 0
       -
         name: Set up Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: 1.25.x
       -