Bump AvalonEdit from 5.0.4 to 6.1.2.30

Bumps [AvalonEdit](https://github.com/icsharpcode/AvalonEdit) from 5.0.4 to 6.1.2.30.
- [Release notes](https://github.com/icsharpcode/AvalonEdit/releases)
- [Changelog](https://github.com/icsharpcode/AvalonEdit/blob/master/ChangeLog.md)
- [Commits](https://github.com/icsharpcode/AvalonEdit/commits)

---
updated-dependencies:
- dependency-name: AvalonEdit
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[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="6.1.2.30" targetFramework="net472" />
   <package id="Costura.Fody" version="5.7.0" targetFramework="net472" />
   <package id="Flurl" version="3.0.2" targetFramework="net472" />
   <package id="Flurl.Http" version="3.2.0" targetFramework="net472" />