RFR: 8321638: Update to SWT 4.30

[Ambarish Rapte]

On Wed, 3 Jan 2024 18:39:58 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> This PR updates the version of SWT that we use we use when building and testing the `javafx.swt` modules to 4.30.
> 
> NOTE: we do not distribute SWT, but only use it during build and (manual) test.
> 
> We currently use SWT 4.6. In addition to being old, this version does not provide macOS / aarch64 binaries, which are needed for testing on that platform.
> 
> I've tested this on all platforms.

Verified on Windows.

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Marked as reviewed by arapte (Reviewer).

PR Review: https://git.openjdk.org/jfx/pull/1315#pullrequestreview-1803428694