Update to PipeWire 0.3.26 and enable JACK functionality

This updates to version 0.3.26, the version landing in Fedora 34 to resolve a number of issues around Bluetooth audio.

Additionally, this release allows supporting JACK clients without a build dependency on JACK itself and we can serve fully as a replacement for JACK at build-time too.

Reference upstream Fedora package commits:

• https://src.fedoraproject.org/rpms/pipewire/c/81fb7bdd1f269d7f88b7f857bdf7291f1c6c2faf
• https://src.fedoraproject.org/rpms/pipewire/c/0f423aee5016ac80eb8e5a7508733b5844ad546a
• https://src.fedoraproject.org/rpms/pipewire/c/27a159e4ff1fe5690e4eff7dd5a638c23b11704b
• https://src.fedoraproject.org/rpms/pipewire/c/fc1ac3105e5e48e1585e65253d417d4f6bc5689d

Relates: rhbz#1945951

Resolves: rhbz#1956854