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

Author: renovate[bot]

.github/workflows/i18n_sync.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Setup go
         uses: actions/setup-go@v6
         with:
-          go-version: "1.25"
+          go-version: "1.25.6"
           cache-dependency-path: backend/go.sum
 
       - name: Generate and update lang files