Bump AvalonEdit from 5.0.4 to 6.1.1

Bumps [AvalonEdit](https://github.com/icsharpcode/AvalonEdit) from 5.0.4 to 6.1.1.
- [Release notes](https://github.com/icsharpcode/AvalonEdit/releases)
- [Changelog](https://github.com/icsharpcode/AvalonEdit/blob/master/ChangeLog.md)
- [Commits](icsharpcode/AvalonEdit@5.0.4...v6.1.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

MeetupToRTM/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="AvalonEdit" version="5.0.4" targetFramework="net472" />
+  <package id="AvalonEdit" version="6.1.1" targetFramework="net472" />
   <package id="Costura.Fody" version="5.1.0" targetFramework="net472" />
   <package id="Flurl" version="3.0.1" targetFramework="net472" />
   <package id="Flurl.Http" version="3.0.1" targetFramework="net472" />