RFR: 8314484: Update Gradle to 8.4

[Ambarish Rapte]

Upgrade gradle to version 8.4.
It also includes a change for adding task dependency for windows platform that was missed in [JDK-8314486](https://bugs.openjdk.org/browse/JDK-8314486)

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Commit messages:
 - chmod 644 gradlew
 - fix win task dependency
 - upgrade gradle to 8.4

Changes: https://git.openjdk.org/jfx/pull/1257/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1257&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314484
  Stats: 261 lines in 7 files changed: 11 ins; 236 del; 14 mod
  Patch: https://git.openjdk.org/jfx/pull/1257.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1257/head:pull/1257

PR: https://git.openjdk.org/jfx/pull/1257