lib/micropython-lib: Update submodule to latest.

This brings in:
- requests: do not leak header modifications when calling request
- mip: allow relative URLs in package.json
- mip: make mip.install() skip /rom*/lib directories
- umqtt.simple: restore legacy ssl/ssl_params arguments
- nrf24l01: increase startup delay
- nrf24l01: properly handle timeout
- nrf24l01: optimize status reading
- lora-sx126x: fix invert_iq_rx / invert_iq_tx behaviour
- unix-ffi/json: accept both str and bytes as arg for json.loads()
- unix-ffi/machine: use libc if librt is not present
- requests: use the host in the redirect url, not the one in headers
- aiohttp: fix header case sensitivity
- aiohttp: allow headers to be passed to a WebSocketClient
- usb-device-cdc: optimise writing small data so it doesn't require alloc
- inspect: fix isgenerator logic
- inspect: implement iscoroutinefunction and iscoroutine

Signed-off-by: Damien George <[email protected]>

Author: dpgeorge