RFR: 8345063: Centralize version number of the Gradle build file [v2]

[Kevin Rushforth]

On Tue, 26 Nov 2024 18:47:00 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> Centralizes version numbers in a single place. This is not the best way of doing it in Gradle, but it's an improvement that will simplify other changes. I used the `build.properties` file because other versions are already written there.
>> 
>> There are other version numbers in the build file, but they are not attached directly to a dependency. Mostly libav ones. I decided not to touch them.
>
> Nir Lisker has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Added EOF line

Marked as reviewed by kcr (Lead).

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PR Review: https://git.openjdk.org/jfx/pull/1649#pullrequestreview-2462431891