test unpinning pytest

without changing any tests

Author: szokeasaurusrex

requirements-devenv.txt

@@ -1,5 +1,5 @@
 -r requirements-linting.txt
 -r requirements-testing.txt
 mockupdb # required by `pymongo` tests that are enabled by `pymongo` from linter requirements
-pytest<7.0.0 # https://github.com/pytest-dev/pytest/issues/9621; see tox.ini
+pytest
 pytest-asyncio