python: test with more modern versions

[multani]

Python 3.12 has been released in October 2023, it should be tested in the CI.

Python 3.7 is not maintained anymore, removing it from the minimum required version in pyproject.toml files.

PR checklist

• [ ] Read the contribution guidelines.
• [ ] Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• [ ] Run the following to build the project and update samples:

  ./mvnw clean package 
  ./bin/generate-samples.sh ./bin/configs/*.yaml
  ./bin/utils/export_docs_generators.sh
  

  (For Windows users, please run the script in Git BASH) Commit all changed files. This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master. These must match the expectations made by your contribution. You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*. IMPORTANT: Do NOT purge/delete any folders/files (e.g. tests) when regenerating the samples as manually written tests may be removed.
• [ ] File the PR against the correct branch: master (upcoming 7.6.0 minor release - breaking changes with fallbacks), 8.0.x (breaking changes without fallbacks)
• [ ] If your PR is targeting a particular programming language, @mention the technical committee members, so they are more likely to review the pull request.

[multani]

Releasing the Python version to >= 3.8 pulls in a newer version of aiohttp, which triggers this bug: https://github.com/aio-libs/aiohttp/issues/8555

[multani]

cc @cbornet (2017/09) @tomplus (2018/10) @krjakbrjak (2023/02) @fa0311 (2023/10) @multani (2023/10)

[multani]

@wing328 when you have time, could you check this out?

[wing328]

just merged. thanks for the PR

[multani]

We can also wait until end of October and completely remove 3.8 then :D

[wing328]

Usually we won't drop the support right away even though it has reached the EOL as some users may still be using it.