Revert "chore(deps): update dependency gitversion.msbuild to v6 (#29)"

This reverts commit 122236b.

Author: hazzik

src/Directory.Build.props

@@ -26,6 +26,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="GitVersion.MsBuild" Version="6.0.4" PrivateAssets="all"/>
+    <PackageReference Include="GitVersion.MsBuild" Version="5.12.0" PrivateAssets="all"/>
   </ItemGroup>
 </Project>