Fix type annotation for reqeust_or_environ parameters

[zjmil]

Small update to the type annotation of the request_or_environ parameter of Request.make_conditional to accept a Request in addition to a WSGIEnvironment (as the name suggests).

• fixes #

Checklist:

• Add tests that demonstrate the correct behavior of the change. Tests should fail without the change.
• Add or update relevant docs, in the docs folder and in code.
• Add an entry in CHANGES.rst summarizing the change and linking to the issue.
• Add .. versionchanged:: entries in any relevant code docs.
• Run pre-commit hooks and fix any issues.
• Run pytest and tox, no tests failed.