docker images used in many tests are about to be removed

docker.io are already doing brown-outs and it's only a matter of time before they are removed.

This IronMQ failure is just one of many.

Example
```
Pulling ironauth (iron/auth:)...
latest: Pulling from iron/auth
[DEPRECATION NOTICE] Docker Image Format v1, and Docker Image manifest version 2, schema 1 support will be removed in an upcoming release. Suggest the author of docker.io/iron/auth:latest to upgrade the image to the OCI Format, or Docker Image manifest v2, schema 2. More information at https://docs.docker.com/go/deprecated-image-specs/
Digest: sha256:bb294b8[14](https://github.com/apache/incubator-pekko-connectors/actions/runs/6343629147/job/17231955796#step:5:15)186729757beb35a130e8cccce2a056ef227ae4f85[15](https://github.com/apache/incubator-pekko-connectors/actions/runs/6343629147/job/17231955796#step:5:16)7d26b8536208
Status: Downloaded newer image for iron/auth:latest
Pulling ironmq (iron/mq:)...
Get "https://registry-1.docker.io/v2/": EOF
```

Start by inventorying the Docker images used by the tests, using the IronMQ failure and linked CI run as an example. Identify which referenced images rely on deprecated Docker formats or are unavailable, then verify that the test suite can pull supported replacements without the reported failures.

Written by the indexing model from the issue text.