Update gstreamer to version 1.20.5 / rev 82 via SR 1045094
    
    https://build.opensuse.org/request/show/1045094
    by user iznogood + dimstar_suse
    - update to 1.20.5:
      + This release only contains bugfixes and it should be safe to
        upgrade from 1.20.x.
      + systemclock waiting fixes for certain 32-bit platforms/libcs
      + alphacombine: robustness improvements for corner case scenarios
      + avfvideosrc: Report latency when doing screen capture
      + d3d11videosink: various thread-safety and stability fixes
      + decklink: fix performance issue when HDMI signal has been lost
        for a long time
      + flacparse: Fix handling of headers advertising 32 bits per
        sample
      + mpegts: Handle when iconv doesn't support ISO 6937 (e.g. musl
        libc)
      + opengl: fix automatic dispmanx detection for rpi4 and fix usage
        of eglCreate/DestroyImage
      + opusdec: Various channel-related fixes
      + textrender: event handling fixes, esp. for GAP event
      +