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applemedia plugin fails to load on ARM64 macOS

Tested with the macOS universal binaries:

$ /Library/Frameworks/GStreamer.framework/Commands/gst-inspect-1.0 applemedia

(gst-plugin-scanner:77367): GStreamer-WARNING **: 20:24:47.214: Failed to load plugin '/Library/Frameworks/GStreamer.framework/Versions/1.0/lib/gstreamer-1.0/libgstapplemedia.dylib': dlopen(/Library/Frameworks/GStreamer.framework/Versions/1.0/lib/gstreamer-1.0/libgstapplemedia.dylib, 2): Library not loaded: @rpath/lib/libMoltenVK.dylib
  Referenced from: /Library/Frameworks/GStreamer.framework/Versions/1.0/lib/gstreamer-1.0/libgstapplemedia.dylib
  Reason: no suitable image found.  Did find:
	/Library/Frameworks/GStreamer.framework/Versions/1.0/lib/gstreamer-1.0/../../lib/libMoltenVK.dylib: code signature in (/Library/Frameworks/GStreamer.framework/Versions/1.0/lib/gstreamer-1.0/../../lib/libMoltenVK.dylib) not valid for use in process using Library Validation: Trying to load an unsigned library
	/Library/Frameworks/GStreamer.framework/Versions/1.0/libexec/gstreamer-1.0/../../lib/libMoltenVK.dylib: code signature in (/Library/Frameworks/GStreamer.framework/Versions/1.0/libexec/gstreamer-1.0/../../lib/libMoltenVK.dylib) not valid for use in process using Library Validation: Trying to load an unsigned library
	/Library/Frameworks/GStreamer.framework/Versions/1.0/libexec/gstreamer-1.0/../../lib/libMoltenVK.dylib: stat() failed with errno=1
	/Library/Frameworks/GStreamer.framework/Versions/1.0/lib/../lib/libMoltenVK.dylib: code signature in (/Library/Frameworks/GStreamer.framework/Versions/1.0/lib/../lib/libMoltenVK.dylib) not valid for use in process using Library Validation: Trying to load an unsigned library
	/Library/Frameworks/GStreamer.framework/Versions/1.0/libexec/gstreamer-1.0/../../lib/libMoltenVK.dylib: code signature in (/Library/Frameworks/GStreamer.framework/Versions/1.0/libexec/gstreamer-1.0/../../lib/libMoltenVK.dylib) not valid for use in process using Library Validation: Trying to load an unsigned library
	/Library/Frameworks/GStreamer.framework/Versions/1.0/libexec/gstreamer-1.0/../../lib/libMoltenVK.dylib: code signature in (/Library/Frameworks/GStreamer.framework/Versions/1.0/libexec/gstreamer-1.0/../../lib/libMoltenVK.dylib) not valid for use in process using Library Validation: Trying to load an unsigned library
	/Library/Frameworks/GStreamer.framework/Versions/1.0/libexec/gstreamer-1.0/../../lib/libMoltenVK.dylib: stat() failed with errno=1
No such element or plugin 'applemedia'

Works fine on x86_64:

$ /Library/Frameworks/GStreamer.framework/Commands/gst-inspect-1.0 applemedia
Plugin Details:
  Name                     applemedia
  Description              Elements for capture and codec access on Apple macOS and iOS
  Filename                 /Library/Frameworks/GStreamer.framework/Versions/1.0/lib/gstreamer-1.0/libgstapplemedia.dylib
  Version                  1.19.90
  License                  LGPL
  Source module            gst-plugins-bad
  Source release date      2022-01-28
  Binary package           GStreamer Bad Plug-ins source release
  Origin URL               Unknown package origin

  atdec: AudioToolbox based audio decoder
  avfassetsrc: Source and decoder for AVFoundation assets
  avfdeviceprovider: AVF Device Provider
  avfvideosrc: Video Source (AVFoundation)
  avsamplebufferlayersink: AV Sample video sink
  vtdec: Apple VideoToolbox decoder
  vtdec_hw: Apple VideoToolbox decoder (hardware only)
  vtenc_h264: H.264 encoder
  vtenc_h264_hw: H.264 (HW only) encoder
  vtenc_prores: Apple ProRes encoder

  10 features:
  +-- 9 elements

Not a regression because macOS ARM64 support is new in 1.20