Bump AvalonEdit from 6.0.0-rc1 to 6.0.0
Bump AvalonEdit from 6.0.0-rc1 to 6.0.0

Bumps [AvalonEdit](https://github.com/icsharpcode/AvalonEdit) from 6.0.0-rc1 to 6.0.0.
- [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/v6.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
campersau/NuGetPackageExplorer,NuGetPackageExplorer/NuGetPackageExplorer,NuGetPackageExplorer/NuGetPackageExplorer