RFR: 8368572: Update WebKit to 623.1

[Kevin Rushforth]

On Fri, 16 Jan 2026 06:58:40 GMT, Hima Bindu Meda <hmeda at openjdk.org> wrote:

> This PR updates Webkit to v623.1. Verified build and sanity on Mac, Linux and Windows platforms. No issue seen.

@HimaBinduMeda Please wait for me to review / test this before integrating.

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PR Comment: https://git.openjdk.org/jfx/pull/2042#issuecomment-3768477302