libsoup: upgrade 3.0.6 -> 3.0.7

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]

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 800e0d32)
Signed-off-by: Steve Sakoman <steve@sakoman.com>