Changes in libsoup from 3.0.7 to 3.1.1:

* Reintroduce some thread-safety to SoupSession (see https://libsoup.org/libsoup-3.0/client-thread-safety.html) [Carlos Garcia Campos]
* Add SoupServerMessage:tls-peer-certificate and SoupServerMessage:tls-peer-certificate-errors [Ignacio Casal Quinteiro]
* Port docs to gi-docgen [Maximiliano Sandoval R]
* Update documentation [Patrick Griffis]