wireplumber: update to master

wireplumber: update to master

* Adds volume controls
* Adds useful subcommands in wireplumber-cli

George Kiagiadakis (15):
      lib: rename WpEndpoint* to WpBaseEndpoint*
      lib: implement WpEndpoint (interface + Proxy + Exported + unit test)
      endpoint: export name, media class & direction + finetune the global properties
      session: ensure the exported properties do not leak object, client & factory ids
      softdsp-endpoint: export Endpoint object on the pipewire registry
      config-policy: avoid race condition in the unit tests
      endpoint: implement get_{name,media_class,direction}
      exported: delay export until the core is connected
      modules: implement module-session, a WpSession provider module
      cli: extend with operations to list endpoints and change the default
      softdsp-endpoint: implement volume controls via the exported endpoint
      cli: add a set-volume command
      core: change idle_add to take a GDestroyNotify as well and return a source id
      endpoint proxy: don't try to set a control value if the proxy is destroyed
      meson: install a pkgconfig file for libwireplumber

Julian Bouzas (3):
      stream: clear proxy when finalizing
      tests: clear core weak reference when finalizing endpoint-link-fake
      tests: improved config policy priority test to make sure endpoint role works

Bug-AGL: SPEC-2986

Change-Id: Ifc30465c7e24c49ab475adbca590f6aca0e67600
Signed-off-by: George Kiagiadakis <george.kiagiadakis@collabora.com>