py-cheroot: updated to 6.2.1

v6.2.1:
:pr:83: Fix regression, caused by inverted check for Windows OS.
Add more URLs to distribution metadata

v6.2.0:
:pr:37: Implement PEERCRED lookup over UNIX-socket HTTP connection.
Discover connected process' PID/UID/GID
Respect server switches: peercreds_enabled and peercreds_resolve_enabled
get_peer_creds and resolve_peer_creds methods on connection
peer_pid, peer_uid, peer_gid, peer_user and peer_group properties on connection
X_REMOTE_PID, X_REMOTE_UID, X_REMOTE_GID, X_REMOTE_USER (REMOTE_USER) and X_REMOTE_GROUP WSGI environment variables when enabled and supported
Per-connection caching to reduce lookup cost

(adam)