fix: force SNAPSHOT update in CI build (-U flag)

Maven cache can serve stale cameleer3-common SNAPSHOTs. The -U flag
forces Maven to check the remote registry for updated SNAPSHOTs on
every build.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -55,7 +55,7 @@ jobs:
           REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
 
       - name: Build and Test
-        run: mvn clean verify -DskipITs --batch-mode
+        run: mvn clean verify -DskipITs -U --batch-mode
 
   docker:
     needs: build