CGA-6ffr-3hfp-9f86

When we try to upgrade the quic-go dependency to v0.54.1 we are getting build failures. This indicates an incompatibility between the syncthing dependency version and the updated quic-go library version. The code is trying to use quic.Connection type that is undefined, and there are type mismatches where *quic.Stream pointers cannot be used as quic.Stream values in struct literals. Upstream syncthing will have to update their code and dependencies to make use of quic-go >= v0.54.1