Remove upper bound pin on typing extensions

[patrick91]

Upper bounds should be done in user land :)

Should fix this issue: strawberry-graphql/strawberry#2533

Closes #572

[k9ert]

Discussed also in #572

[achow101]

setup.py is automatically generated, our dependencies are managed with poetry in pyproject.toml. Please update in there.

Upper bounds should be done in user land :)

They use semver, so that introduces the possibility of a breaking change in newer major versions, so we should upper bound on the current major version and evaluate whether new major versions are incompatible.

[k9ert]

setup.py is automatically generated, our dependencies are managed with poetry in
pyproject.toml. Please update in there.

I've created #666
Thanks @patrick91 for your effort.
@achow101 i guess you can close this PR.