RFR: 8366217: Update GStreamer to 1.26.5

[Alexander Matveev]

- GStreamer updated to 1.26.5.
- Tested on all platforms with all supported formats.

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Commit messages:
 - 8366217: Update GStreamer to 1.26.5 [v7]
 - 8366217: Update GStreamer to 1.26.5 [v6]
 - 8366217: Update GStreamer to 1.26.5 [v5]
 - 8366217: Update GStreamer to 1.26.5 [v4]
 - 8366217: Update GStreamer to 1.26.5 [v3]
 - 8366217: Update GStreamer to 1.26.5 [v2]
 - 8366217: Update GStreamer to 1.26.5

Changes: https://git.openjdk.org/jfx/pull/1894/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1894&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366217
  Stats: 18884 lines in 166 files changed: 14131 ins; 2041 del; 2712 mod
  Patch: https://git.openjdk.org/jfx/pull/1894.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1894/head:pull/1894

PR: https://git.openjdk.org/jfx/pull/1894