I just found this message in the logs from an up-to-date Greenbone Community Edition environment
Remote manager daemon uses an unsupported version of GMP. The GMP version was 22.5
It seems to be happening since last Friday January 12th.
I suppose you are using some Python script to automate things because this error message is from https://github.com/greenbone/python-gvm/blob/main/gvm/protocols/gmp.py#L111-L114 To fix that you need to update python-gvm to 23.12.0 or later.
Thank you @bricks!
I have updated python-gvm from version 23.11.0 to 24.1.0 and now everything runs normally.