Update dependency GitVersion.MsBuild to v6

Author: renovate[bot]

IDLImporter/IDLImporter.csproj

@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="Antlr2.Runtime.Patched" Version="2.7.7" />
     <PackageReference Include="Antlr2.Tools.Patched" Version="2.7.6.5" PrivateAssets="All" />
-    <PackageReference Include="GitVersion.MsBuild" Version="5.12.0" PrivateAssets="All" />
+    <PackageReference Include="GitVersion.MsBuild" Version="6.4.0" PrivateAssets="All" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="SIL.ReleaseTasks" Version="3.0.0" PrivateAssets="All" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />

IDLImporterTests/IDLImporterTests.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="GitVersion.MsBuild" Version="5.12.0" PrivateAssets="All" />
+    <PackageReference Include="GitVersion.MsBuild" Version="6.4.0" PrivateAssets="All" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="NUnit" Version="3.14.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />

IdlImpTool/IDLImp.csproj

@@ -13,7 +13,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="GitVersion.MsBuild" Version="5.12.0" PrivateAssets="All" />
+    <PackageReference Include="GitVersion.MsBuild" Version="6.4.0" PrivateAssets="All" />
     <PackageReference Include="SIL.ReleaseTasks" Version="3.0.0" PrivateAssets="All" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
   </ItemGroup>