urllib3 v2 breaks detection of http_client_requests in apps that use the "requests" package

[apotterri]

The latest version of the widely-used requests package has changed to depend on v2 of urllib3. This breaks capturing of http_client_requests for apps that use it.

Pinning to v1 of urllib3 (as suggested in the requests doc) fixes this, but appmap-python should support both versions of urllib3.