[jfx17u] RFR: 8307642: Change JavaFX release version to 17.0.8 in jfx17u

[Johan Vos]

Increase the security version for JavaFX 17 to 8
Fix for JDK-8307642

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

Commit messages:
 - Increase the security version for JavaFX 17 to 8

Changes: https://git.openjdk.org/jfx17u/pull/131/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=131&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307642
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx17u/pull/131.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u.git pull/131/head:pull/131

PR: https://git.openjdk.org/jfx17u/pull/131