Bump org.testfx:testfx-junit5 from 4.0.17 to 4.0.18 (#7055)

Bumps [org.testfx:testfx-junit5](https://github.com/TestFX/TestFX) from 4.0.17 to 4.0.18.
- [Release notes](https://github.com/TestFX/TestFX/releases)
- [Changelog](https://github.com/TestFX/TestFX/blob/master/CHANGES.md)
- [Commits](https://github.com/TestFX/TestFX/commits)

---
updated-dependencies:
- dependency-name: org.testfx:testfx-junit5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build.gradle

@@ -267,7 +267,7 @@ dependencies {
     testImplementation group: 'org.junit.jupiter', name:  'junit-jupiter-params', version: '5.10.2'
     testRuntimeOnly group: 'org.junit.jupiter', name: 'junit-jupiter-engine', version: '5.10.2'
     testImplementation group: 'org.hamcrest', name: 'hamcrest', version: '2.2'
-    testImplementation group: 'org.testfx', name: 'testfx-junit5', version: '4.0.17'
+    testImplementation group: 'org.testfx', name: 'testfx-junit5', version: '4.0.18'
     // TODO openjfx-monocle is no longer updated and chances are openjfx-monocle doesn't work with latest OpenJFX
     // https://github.com/TestFX/Monocle/issues/79
     testImplementation group: 'org.testfx', name: 'openjfx-monocle', version: 'jdk-12.0.1+2'