devel/libsoup3: update to 3.1.1 release (+)

Changes in libsoup from 3.0.6 to 3.0.7:

* Fix leak in SoupAuthNTLM [Milan Crha]
* Fix constructing SoupAuthNTLM objects [Milan Crha]
* Disable mutual negotiation in SoupAuthNegotiate [Michael Catanzaro]
* http2: Do not advertise the `h2` protocool for proxy connections [Carlos Garcia Campos]
* http2: Remove left-over headers when HTTP/1 redirects to HTTP/2 [Carlos Garcia Campos]
* http2: Handle HTTP_1_1_REQUIRED error [Carlos Garcia Campos]
* http2: Read request bodies synchronously for sync requests [Carlos Garcia Campos]
* http2: Properly handle server sending shut down GOAWAY [Carlos Garcia Campos]
* tests: Remove dependency on Apache's PHP module [Carlos Garcia Campos]
* tests: Depend upon Apache's http2 module [Carlos Garcia Campos]

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]