remove python 3.9 support (#10406)

Fixes https://github.com/certbot/certbot/issues/10389. you can compare
this to the PR that did this for python 3.8 at
https://github.com/certbot/certbot/pull/10077

additional changes:
- linux-py310 test is removed from extended tests, since it's now run in
standard tests. additionally, openssl will never be < 1.1.1 now, due to
https://peps.python.org/pep-0644/.
- `letstest/scripts/test_openssl_version.py` was testing functionality
that was removed in https://github.com/certbot/certbot/pull/10373 so it
was deleted

---------

Co-authored-by: Brad Warren <bmw@users.noreply.github.com>

tools/pinning/oldest/pyproject.toml

@@ -18,7 +18,7 @@ license = "Apache License 2.0"
 [tool.poetry.dependencies]
 # The Python version here should be kept in sync with the one used in our
 # oldest tests in tox.ini.
-python = "<3.10 >= 3.9.2"
+python = "<3.11 >= 3.10"
 
 # Local dependencies
 # Any local packages that have dependencies on other local packages must be