Update dependency protobuf to v5.29.0 (#733)

| datasource | package  | from   | to     |
| ---------- | -------- | ------ | ------ |
| pypi       | protobuf | 5.28.3 | 5.29.0 |

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

test/requirements.ci.txt

@@ -1,6 +1,6 @@
 docker==7.1.0
 grpcio==1.68.0
-protobuf==5.28.3
+protobuf==5.29.0
 requests==2.32.3
 urllib3==2.2.3
 websocket-client==1.8.0