gst-libav/1.27.90 package update (#77252)

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**Commit**: a5e6480385179a917d3cb8590ceba29321111381

> **Note:** If you need to make manual changes to this PR, apply the
`skip:staging-update-bot` label so the reconciler won't overwrite them.

<!--staging-update-bot-pr-data-->
<!--
{
  "PackageName": "gst-libav",
  "Version": "1.27.90",
  "Commit": "a5e6480385179a917d3cb8590ceba29321111381",
  "BumpEpoch": false,
  "Manual": false
}
-->
<!--/staging-update-bot-pr-data-->

Co-authored-by: staging-update-bot <staging-update-bot@chainguard.dev>
Co-authored-by: Amber Arcadia <amber.arcadia@chainguard.dev>

Author: 3 people

gst-libav.yaml

@@ -1,6 +1,6 @@
 package:
   name: gst-libav
-  version: "1.27.50"
+  version: "1.27.90"
   epoch: 0
   description: GStreamer plugin for using the encoders, decoders, muxers, and demuxers provided by FFmpeg.
   copyright:
@@ -22,7 +22,7 @@ pipeline:
     with:
       repository: https://github.com/GStreamer/gstreamer
       tag: ${{package.version}}
-      expected-commit: 98f0ec4b5dd48b36365e85ad8695e88b4a7d7ec0
+      expected-commit: a5e6480385179a917d3cb8590ceba29321111381
 
   - working-directory: subprojects/gst-libav
     pipeline: