update avalonia and shell with mem leak fixes.
MODIFY
Directory.Build.targets
Directory.Build.targets
<Project>
<PropertyGroup>
- <AvaloniaVersion>0.7.1-cibuild0001439-beta</AvaloniaVersion>
+ <AvaloniaVersion>0.7.1-cibuild0001522-beta</AvaloniaVersion>
<AvaloniaBehaviorsVersion>0.7.0</AvaloniaBehaviorsVersion>
</PropertyGroup>

MODIFY
WalletWasabi.Dependencies/AvalonStudio.Shell
WalletWasabi.Dependencies/AvalonStudio.Shell
-Subproject commit 8413972a1a1f2bebf0dfa22b395639c9c7bb1a3c
+Subproject commit 1fdb82f88c24ca55ce5e5105ef8773e6d1b0e3fd

update avalonia and shell with mem leak fixes.