Bump Nerdbank.GitVersioning from 3.8.118 to 3.9.50

---
updated-dependencies:
- dependency-name: Nerdbank.GitVersioning
  dependency-version: 3.9.50
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Ix.NET/Source/Directory.Build.props

@@ -30,7 +30,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All"/>
-    <PackageReference Include="Nerdbank.GitVersioning" Version="3.8.118" PrivateAssets="all" />
+    <PackageReference Include="Nerdbank.GitVersioning" Version="3.9.50" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>