Bump org.fxmisc.richtext:richtextfx from 0.9.2 to 0.11.4

Bumps [org.fxmisc.richtext:richtextfx](https://github.com/FXMisc/RichTextFX) from 0.9.2 to 0.11.4.
- [Release notes](https://github.com/FXMisc/RichTextFX/releases)
- [Changelog](https://github.com/FXMisc/RichTextFX/blob/master/CHANGELOG.md)
- [Commits](FXMisc/RichTextFX@v0.9.2...v0.11.4)

---
updated-dependencies:
- dependency-name: org.fxmisc.richtext:richtextfx
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -627,7 +627,7 @@
         <dependency>
             <groupId>org.fxmisc.richtext</groupId>
             <artifactId>richtextfx</artifactId>
-            <version>0.9.2</version>
+            <version>0.11.4</version>
         </dependency>
 
         <!-- We need two incompatible versions of controlsfx, one for Java 8, and one for Java 9+ -->