chore(deps): update dependency go to v1.25.6

Author: renovate[bot]

.github/workflows/pr-auditor.yml

@@ -14,7 +14,7 @@ jobs:
           repository: 'sourcegraph/devx-service'
           token: ${{ secrets.PR_AUDITOR_TOKEN }}
       - uses: actions/setup-go@v4
-        with: { go-version: '1.22' }
+        with: { go-version: '1.25.6' }
 
       - run: 'go run ./cmd/pr-auditor'
         env: