update pinned dependencies (#10278)

this fixes the security alerts those with access can see at
https://github.com/certbot/certbot/security/dependabot

i based what needed to be done to drop python < 3.9.2 support on
https://github.com/certbot/certbot/pull/10077 and concluded we only
really needed to update `python_requires`. we could do a deprecation
period for this, but i think it's not necessary. cryptography didn't
(it's not even in mentioned in [their
changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst))
and none of the major LTS distros use python 3.9.0 or 3.9.1

certbot-dns-cloudflare/setup.py

@@ -40,7 +40,7 @@ setup(
     author="Certbot Project",
     author_email='certbot-dev@eff.org',
     license='Apache License 2.0',
-    python_requires='>=3.9',
+    python_requires='>=3.9.2',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',