RFR: 8362079: Change JavaFX release version to 26

[Kevin Rushforth]

Bump the version number of JavaFX to 26. I will integrate this to master as part of forking the jfx25 stabilization branch, which is scheduled for Thursday, July 17, 2025 at 16:00 UTC.

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Commit messages:
 - 8362079: Change JavaFX release version to 26

Changes: https://git.openjdk.org/jfx/pull/1847/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1847&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362079
  Stats: 3 lines in 3 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jfx/pull/1847.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1847/head:pull/1847

PR: https://git.openjdk.org/jfx/pull/1847