[jfx20u] RFR: 8305108: Change JavaFX release version to 20.0.2 in jfx20u

[Kevin Rushforth]

Updates for the beginning of the 20.0.2 release.

-------------

Commit messages:
 - 8305108: Change JavaFX release version to 20.0.2 in jfx20u

Changes: https://git.openjdk.org/jfx20u/pull/10/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx20u&pr=10&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305108
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx20u/pull/10.diff
  Fetch: git fetch https://git.openjdk.org/jfx20u.git pull/10/head:pull/10

PR: https://git.openjdk.org/jfx20u/pull/10