Update python-httpcore to version 0.16.3 / rev 8 via SR 1045130
    
    https://build.opensuse.org/request/show/1045130
    by user mcepl + dimstar_suse
    Forwarded request #1045069 from bnavigator
    
    - Update to 0.16.3
        * Allow ws and wss schemes. Allows us to properly support
          websocket upgrade connections. (#625)
        * Forwarding HTTP proxies use a connection-per-remote-host.
          Required by some proxy implementations. (#637)
        * Don't raise RuntimeError when closing a connection pool with
          active connections. Removes some error cases when cancellations
          are used. (#631)
        * Lazy import anyio, so that it's no longer a hard dependancy,
          and isn't imported if unused. (#639)
      - Add httpcore-allow-deprecationwarnings-test.patch
        gh#encode/httpcore#511, gh#agronholm/anyio#470