Add Python 3.11 and 3.12 to the testing matrix

[sbesson]

Also bump the GitHub actions to work on Node.js 20

[jburel]

Don't we also want to bump the minimum version of omero-py

install_requires=["omero-py>=5.6.0"

[sbesson]

Don't we also want to bump the minimum version of omero-py
install_requires=["omero-py>=5.6.0"

Given this plugin only needs to deal with server-side configuration and there is no client/server connection involvement, the OMERO.py requirements are pretty minimal. Do you have a minimal version in mind?

[jburel]

Nothing in mind. 5.6.0 is 4 years old. We can keep it as no real impact