Pin numba=0.55.2 in dev env and constrain numba>=0.55.2 in ci env

[tomvothecoder]

Description

• Closes [Bug]: “ImportError: Numba needs NumPy 1.21 or less” #279
• This is done to avoid incompatible versions with numpy>=1.22

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

If applicable:

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass with my changes (locally and CI/CD build)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have noted that this is a breaking change for a major release (fix or feature that would cause existing functionality to not work as expected)

[tomvothecoder]

Hey @xCDAT/core-developers, I recommend updating your xcdat_dev env with the latest changes here.

You can run conda env update -f conda-env/dev.yml (or mamba env update -f conda-env/dev.yml)
You must specify -n <NAME_OF_ENV> if you used a custom env name.

[tomvothecoder]

@xCDAT/core-developers actually, you can hold off updating your env. I will probably update the envs in a new PR with the latest version of xarray (2022.6.0), which has a ton of new things like vectorized group by.