[libsoup] (18 commits) ...http2: Ensure signals are disconnected on destroy

[Carlos Garcia Campos <carlosgc src gnome org>]

Summary of changes:

  021efed... docker: Add http2 dependencies (*)
  0b67d5f... ci: Bump image version (*)
  1a1d29c... Add initial HTTP2 backend (*)
  5e36ac4... tests: fix http2 tests (*)
  684c468... session: create a new connection for preconnect requests th (*)
  32dc906... tests: allow to run the http2 tests from the test executabl (*)
  f03639b... http2: disable content sniffer support (*)
  049fe6a... body-input-stream-http2: try to read after emitting need-mo (*)
  8df4fde... io-http2: correctly handle the message io finish condition (*)
  dcd8bb8... io-http2: fix typo (*)
  e457c6d... Make force http flag private (*)
  4676a06... body-input-stream-http2: Remove unused seekable iface (*)
  700340c... Add SOUP_ENABLE_HTTP2 env var (*)
  f85de49... http2: Avoid creating unused debug messages (*)
  e362fa5... http2: Always handle nghttp2's return value (*)
  3ad0048... http2-body-stream: Add more test coverage (*)
  52b0350... http2: Ignore coverage of unsupported frames (*)
  770e1df... http2: Ensure signals are disconnected on destroy (*)

(*) This commit already existed in another branch; no separate mail sent