Add mypy dependency to build requirements in meta.yaml

[alopezrivera]

No description provided.

[DominicDirkx]

Hi all, this issue started with the release of v0.8.0.dev9, which caused a whole bunch of issues in the tudatpy build that seem difficult to resolve. I've rolled back the release, and have re-opened the pull request:

tudat-team/tudatpy#154

before merging this, I propose we fix the Azure build of the associated changes, by hard-coding the commit in the recipe.yaml, rather than assigning a version. That way, we can merge other tudatpy features, while we resolve this one on the side. I'll patch up the develop branch of the feedstock.

[geoffreygarrett]

AFAIK https://github.com/sizmailov/pybind11-stubgen would be the way to go if mypy was intended for stub generation for code completion etc. I've used it successfully in the past. @alopezrivera

[geoffreygarrett]

I'll close this for now