Bump GitVersion.MsBuild from 5.12.0 to 6.4.0

Updated [GitVersion.MsBuild](https://github.com/GitTools/GitVersion) from 5.12.0 to 6.4.0.

Author: koepalex

src/MainApp/CrowsNestMqtt.App.csproj

@@ -24,7 +24,7 @@
     <PackageReference Include="Avalonia.ReactiveUI" Version="11.2.8" />
     <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.2.8" />
     <PackageReference Include="Avalonia.Themes.Fluent" Version="11.2.8" />
-    <PackageReference Include="GitVersion.MsBuild" Version="5.*">
+    <PackageReference Include="GitVersion.MsBuild" Version="6.4.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>