package/pulseaudio: bump version to 12.0

package/pulseaudio: bump version to 12.0

Release notes:
https://www.freedesktop.org/wiki/Software/PulseAudio/Notes/12.0/

Added license hashes, removed all patches after being applied upstream:
https://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/?id=66885ad633db0f371693475c72133e91f1e09ee5
https://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/?id=dfb0460fb4743aec047cdf755a660a9ac2d0f3fb

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>