chore(deps): update actions/setup-go action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -44,7 +44,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Setup Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: ${{ env.GO_VERSION }}
           cache: false  # The golangci-lint action does its own caching.
@@ -64,7 +64,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Setup Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: ${{ env.GO_VERSION }}