RFR: 8317370: JavaFX runtime version is wrong at runtime

[Kevin Rushforth]

On Mon, 2 Oct 2023 22:06:38 GMT, John Neffenger <jgneff at openjdk.org> wrote:

> Please review these changes to the build timestamp and to the JavaFX runtime version available in the system properties.

The fix and new test both look good. Testing is green.

Can you also change the following in [`UPDATING-VERSION.md`](https://github.com/openjdk/jfx/blob/4d9a8ebe3b0cddfef2a2e9df5915b0f0b8382207/UPDATING-VERSION.md)?

> ```
> modify the testMajorVersion method to increment the feature version number
> from `N` to `N+1`.
> ```

to something like:


modify the `FEATURE` variable to increment the feature version number
from `N` to `N+1`.

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PR Review: https://git.openjdk.org/jfx/pull/1253#pullrequestreview-1668138205