community/libnice: upgrade to 0.1.19

https://gitlab.freedesktop.org/libnice/libnice/-/blob/master/NEWS

libnice 0.1.19 (2022-05-03)
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Allow incoming connchecks before remote candidates are set, allows for connection based on received bind requests
Implement RFC 7675 for Consent Freshness
Use a single server reflexive and local relay candidate, reduces useless duplicated local candidates
Improved ICE restart implementation
Use Windows native crypto API, removing the need for OpenSSL
Add bytestream ICE-TCP and improve ICE-TCP
Add API to know if a NiceAddress is link-local
Add API to extact the relay address from a relayed NiceAddress
Improve support for detection addresses on Android, iOS, macOS
A number of bug fixes