Avoid unclosed SSLSocket warnings

[chamini2]

When using posthog, even when manually calling posthog.shutdown(), we always get a warning at the end:

sys:1: ResourceWarning: unclosed <ssl.SSLSocket fd=10, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('192.168.1.110', 59478), raddr=('34.227.250.33', 443)>

The warning only happens if we did send some messages (try calling flush, which is called by shutdown anyways, to make it show up).

[chamini2]

Hello! Do you guys not get this behavior?