Fix wamp-cicd action path in test-serdes job

Remove incorrect .github/ prefix from action path.
Correct path is wamp-proto/wamp-cicd/actions/upload-artifact-verified@main
not wamp-proto/wamp-cicd/.github/actions/upload-artifact-verified@main

Related to CI failure: https://github.com/crossbario/autobahn-python/actions/runs/19380729500

Author: oberstet

.github/workflows/main.yml

@@ -208,7 +208,7 @@ jobs:
 
       - name: Upload SerDes test results
         if: always()
-        uses: wamp-proto/wamp-cicd/.github/actions/upload-artifact-verified@main
+        uses: wamp-proto/wamp-cicd/actions/upload-artifact-verified@main
         with:
           name: serdes-test-results-${{ matrix.python-env }}
           path: test-results/serdes-${{ matrix.python-env }}/