Update dependency protobuf to v6.33.0 (#957)

| datasource | package  | from   | to     |
| ---------- | -------- | ------ | ------ |
| pypi       | protobuf | 6.32.1 | 6.33.0 |

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

Author: renovate[bot]

test/requirements.ci.txt

@@ -1,6 +1,6 @@
 docker==7.1.0
 grpcio==1.75.1
-protobuf==6.32.1
+protobuf==6.33.0
 requests==2.32.5
 urllib3==2.5.0
 websocket-client==1.9.0