fix versions

Rx.NET/Source/Directory.build.targets

@@ -21,11 +21,11 @@
 
   <ItemGroup Condition="'$(IsTestProject)' != 'true' and '$(SourceLinkEnabled)' != 'false' and '$(TargetFramework)' != 'netcoreapp3.0'">
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.1" />
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta-62925-02" PrivateAssets="All"/>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta2-18618-05" PrivateAssets="All"/>
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Nerdbank.GitVersioning" Version="2.2.36" PrivateAssets="all" />
+    <PackageReference Include="Nerdbank.GitVersioning" Version="2.3.38" PrivateAssets="all" />
   </ItemGroup>
 
   <Target Name="AddCommitHashToAssemblyAttributes" BeforeTargets="GetAssemblyAttributes">