Pin flask.. new release is causing dependency issues and flake for imports5

[raubitsj]

History:
https://pypi.org/project/Flask/2.2.1/#history

actually not sure the dependency is coming from yea-wandb.. but it is likely the culprit

flask 2.2.1 requires Werkzeug>=2.2.0, but you have werkzeug 2.0.2 which is incompatible.

Error:

File "/mnt/ramdisk/.tox/func-s_imports5-py37/lib/python3.7/site-packages/flask/__init__.py", line 4, in <module>
    from . import json as json
  File "/mnt/ramdisk/.tox/func-s_imports5-py37/lib/python3.7/site-packages/flask/json/__init__.py", line 8, in <module>
    from ..globals import current_app
  File "/mnt/ramdisk/.tox/func-s_imports5-py37/lib/python3.7/site-packages/flask/globals.py", line 57, in <module>
    _cv_app, unbound_message=_no_app_msg
TypeError: __init__() got an unexpected keyword argument 'unbound_message'

[dmitryduev]

@raubitsj this is the solution we came up:
https://github.com/wandb/wandb/blob/13a4ab6c24410c70ca0df0e7781c72e018504801/tests/functional_tests/t0_main/imports/05-batch5.py#L14
works great and no yea-wandb releases are necessary

[dmitryduev]

See my comment, this might not be necessary.

[raubitsj]

dropped as a better workaround was provided