[jfx21u] RFR: 8368572: Update WebKit to 623.1

Fri Feb 27 13:00:38 UTC 2026

Hi all,

This pull request contains a backport of commit [422d3a95](https://github.com/openjdk/jfx/commit/422d3a954d531c9cca32b1401b5937b05b1b07fa) from the [openjdk/jfx](https://git.openjdk.org/jfx) repository.

The commit being backported was authored by Hima Bindu Meda on 21 Jan 2026 and was reviewed by Kevin Rushforth, Joeri Sykora and Johan Vos.

Thanks!

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Commit messages:
 - Backport 422d3a954d531c9cca32b1401b5937b05b1b07fa

Changes: https://git.openjdk.org/jfx21u/pull/116/files
  Webrev: Webrev is not available because diff is too large
  Issue: https://bugs.openjdk.org/browse/JDK-8368572
  Stats: 505662 lines in 8991 files changed: 253929 ins; 188948 del; 62785 mod
  Patch: https://git.openjdk.org/jfx21u/pull/116.diff
  Fetch: git fetch https://git.openjdk.org/jfx21u.git pull/116/head:pull/116

PR: https://git.openjdk.org/jfx21u/pull/116