feat: add support for python 3.11

[Nischay-Pro]

Description

This PR updates the Makefile to add support for Python 3.11. Currently, pip-tools < 7.0 is not supported on Python 3.11+.

Configuring a minimum requirement to install pip-tools >= 7.0 provides allows the setup to support 3.11.

Related Items

Partially related to #748

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• I agree to contribute to the project under Apache 2 License.
• To the best of my knowledge, the proposed patch is not based on code under GPL or other license that is incompatible with FlexMeasures

[nhoening]

A change in app.in can be accompanied by an update in app.txt, probably.
Of course, we're unsure if 3.8 can use numpy 1.26 ...

[Nischay-Pro]

A change in app.in can be accompanied by an update in app.txt, probably. Of course, we're unsure if 3.8 can use numpy 1.26 ...

Yeah. I think we can push to 1.24.0 instead of 1.25. Since, 1.25 is not supported for Python 3.8

[nhoening]

Please also officially document the 3.11 support in setup.py (that's largely a copy/paste action)

[Nischay-Pro]

Ran pytest manually with all tests passing on Python 3.11

Results (119.74s (0:01:59)):
     441 passed
       1 skipped

[nhoening]

A change in app.in can be accompanied by an update in app.txt, probably. Of course, we're unsure if 3.8 can use numpy 1.26 ...

Yeah. I think we can push to 1.24.0 instead of 1.25. Since, 1.25 is not supported for Python 3.8

I guess we could defer dealing with the .txt cases in #776 as much as possible.

But can you tell me the steps you did in the Docker container to install requirements under 3.11?
Because as far as I understood, the higher numpy version is needed in 3.11 right? Then we need to reflect that in requirements/app.txt

Let's say we include the app.txt update (for numpy using 1.24) in this PR.
I would then like to know if 3.8 will still run.

[Nischay-Pro]

For the docker container, I just checked if the Python version being installed was Python 3.11. From there I just ran pytests in the container using make test and it installed the dependencies and ran pytest.

The make file as modified would ensure that 3.11 dependencies are installed. Currently, the numpy version did not require a bump as the dependencies are working as expected. If we bump numpy to a version > 1.24 we will lose support for Python 3.8 I just raised the maximum supported numpy version to be under 1.25 since 1.24 is the last supported numpy version supporting Python 3.8

[nhoening]

Okay so if we don't need a bump in numpy then all dependencies in .txt are okay right now for 3.11. Thanks.