RFR: 8259277: Change JavaFX release version to 17

[Kevin Rushforth]

Bump the version number of JavaFX to 17. I will integrate this immediately after forking the `jfx16` stabilization branch.

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Commit messages:
 - 8259277: Change JavaFX release version to 17

Changes: https://git.openjdk.java.net/jfx/pull/371/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=371&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259277
  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jfx/pull/371.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/371/head:pull/371

PR: https://git.openjdk.java.net/jfx/pull/371