[jfx21u] RFR: 8323830: Change JavaFX release version to 21.0.3 in jfx21u

[Kevin Rushforth]

On Tue, 16 Jan 2024 20:30:01 GMT, Johan Vos <jvos at openjdk.org> wrote:

> Start work on 21.0.3

Marked as reviewed by kcr (Lead).

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PR Review: https://git.openjdk.org/jfx21u/pull/41#pullrequestreview-1824990450