deps(deps-dev): bump javafx.version from 21.0.2 to 26.0.2

[dependabot]

Bumps javafx.version from 21.0.2 to 26.0.2.
Updates org.openjfx:javafx-controls from 21.0.2 to 26.0.2

Updates org.openjfx:javafx-swing from 21.0.2 to 26.0.2

[DemchaAV]

Closing: this bump cannot land while the CI matrix still builds on JDK 17.

JavaFX follows the JDK it was built against and 21.x is the last line that runs on 17. javafx-controls:26 resolves, but its classes are not visible to a release 17 compile, so qa's JavaFX dev-preview tool fails to build — that is the Build and run tests (JDK 17) failure on this PR:

GraphComposeDevTool.java:[615,24] cannot find symbol
  symbol: class TextArea
  ... class Label, variable FontWeight, variable Font

#471 adds an ignore rule for major org.openjfx bumps so this is not re-proposed every Monday; patch and minor updates inside 21.x still arrive. The rule carries the condition for removing it — the matrix floor moving past JDK 17.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.