gstreamer1.0: upgrade 1.20.3 -> 1.20.4

The fourth 1.20 bug-fix release (1.20.4) was released on 12 October 2022.

This release only contains bugfixes and it should be safe to upgrade from 1.20.x.

Highlighted bugfixes in 1.20.4

- avaudiodec: fix playback issue with WMA files, would throw an error at EOS with FFmpeg 5.x
- Fix deadlock when loading gst-editing-services plugin
- Fix input buffering capacity in live mode for aggregator, video/audio aggregator subclasses, muxers
- glimagesink: fix crash on Android
- subtitle handling and subtitle overlay fixes
- matroska-mux: allow width + height changes for avc3|hev1|vp8|vp9
- rtspsrc: fix control url handling for spec compliant servers and add fallback for incompliant servers
- WebRTC fixes
- RTP retransmission fixes
- video: fixes for formats with 4x subsampling and horizontal co-sited chroma (Y41B, YUV9, YVU9 and IYU9)
- macOS build and packaging fixes, in particular fix finding of gio modules on macOS for https/TLS support
- Fix consuming of the macOS package as a framework in XCode
- Performance improvements
- Miscellaneous bug fixes, memory leak fixes, and other stability and reliability improvements

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
(cherry picked from commit 58e48253)
Signed-off-by: Steve Sakoman <steve@sakoman.com>