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>

acme/setup.py

@@ -32,14 +32,13 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9.2',
+    python_requires='>=3.10',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: Apache Software License',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',

acme/src/acme/__init__.py

@@ -6,7 +6,6 @@ This module is an implementation of the `ACME protocol`_.
 
 """
 import sys
-import warnings
 
 # This code exists to keep backwards compatibility with people using acme.jose
 # before it became the standalone josepy package.
@@ -20,10 +19,3 @@ for mod in list(sys.modules):
     # preserved (acme.jose.* is josepy.*)
     if mod == 'josepy' or mod.startswith('josepy.'):
         sys.modules['acme.' + mod.replace('josepy', 'jose', 1)] = sys.modules[mod]
-
-if sys.version_info[:2] == (3, 9):
-    warnings.warn(
-            "Python 3.9 support will be dropped in the next planned release of "
-            "acme. Please upgrade your Python version.",
-            DeprecationWarning,
-    )  # pragma: no cover