Update javafx to v26

Author: renovate[bot]

gradle/libs.versions.toml

@@ -20,7 +20,7 @@ logback-classic = "1.5.18"
 tornadofx = "1.7.20"
 tornadofx-controlsfx = "0.1.1"
 kover = "0.9.1"
-javafx = "23.0.2"
+javafx = "26-ea+2"
 
 [libraries]
 kotlin-stdlib = { module = "org.jetbrains.kotlin:kotlin-stdlib", version.ref = "kotlin" }