[jfx24u] RFR: 8340322: Update WebKit to 620.1

[Jay Bhaskar]

A clean backport to jfx24u. The update is related to webkit upgrae up to 2.46.5.

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Commit messages:
 - Backport 1e6915738d654e6cf7a547e47b8b020117db6bc3

Changes: https://git.openjdk.org/jfx24u/pull/4/files
  Webrev: Webrev is not available because diff is too large
  Issue: https://bugs.openjdk.org/browse/JDK-8340322
  Stats: 773682 lines in 8157 files changed: 644444 ins; 72180 del; 57058 mod
  Patch: https://git.openjdk.org/jfx24u/pull/4.diff
  Fetch: git fetch https://git.openjdk.org/jfx24u.git pull/4/head:pull/4

PR: https://git.openjdk.org/jfx24u/pull/4