Update RichTextFX to fix spam of "Visible paragraphs' last index is [-1]"

[Col-E]

The bug is present in 10.6 but was fixed 2 months ago. When a new release is made it should fix the spam: FXMisc/RichTextFX#1021

Full log

java.lang.IllegalArgumentException: Visible paragraphs' last index is [-1] but visibleParIndex was [0]
	at org.fxmisc.richtext.GenericStyledArea.visibleParToAllParIndex(GenericStyledArea.java:982)
	at org.fxmisc.richtext.ViewActions.firstVisibleParToAllParIndex(ViewActions.java:284)
	at org.fxmisc.richtext.LineNumberFactory.insertParagraphCheck(LineNumberFactory.java:172)
	at org.fxmisc.richtext.LineNumberFactory.lambda$new$2(LineNumberFactory.java:92)

[Jugen]

Hey Matt, sorry I didn't see this earlier otherwise I would have tried to publish a RichTextFX update sooner. Anyways version 0.10.7 is out now and Maven should reflect it in the next 24 hours.

[Col-E]

This repo was actually private until a couple of days ago, no worries 👍

[Col-E]

For SA, 0.10.7 depends on JFX logic introduced in a later version (past the old 8 bundled version) so its effectively incompatible with Java 8 since we use the piece that is dependent.

We planned on moving to Java 11 eventually anyways so this is not a major concern.