urllib3 2.0 introduced plenty of breaking changes:
https://urllib3.readthedocs.io/en/stable/v2-migration-guide.html

mod_nss' tests suite has several failed tests against new urllib3.

• strict param of HTTPConnectionPool has been removed in urllib3 2.0:
  https://github.com/urllib3/urllib3/pull/2064
• VerifiedHTTPSConnection has been removed from urllib3.connectionpool in urllib3 2.0:
  https://github.com/urllib3/urllib3/pull/2768
• get_host was deprecated since urllib 1.5:
  https://github.com/urllib3/urllib3/commit/0c973cada5888e65fb2a26693e08de67038f00e5
  and has been removed in urllib3 2.0:
  https://github.com/urllib3/urllib3/pull/2139