Update nbgv and nerdbank.gitversioning updates to 3.9.50

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.config/dotnet-tools.json

@@ -17,7 +17,7 @@
       "rollForward": false
     },
     "nbgv": {
-      "version": "3.8.118",
+      "version": "3.9.50",
       "commands": [
         "nbgv"
       ],

Directory.Packages.props

@@ -20,7 +20,7 @@
     <GlobalPackageReference Include="CSharpIsNullAnalyzer" Version="0.1.593" />
     <GlobalPackageReference Include="DotNetAnalyzers.DocumentationAnalyzers" Version="1.0.0-beta.59" />
     <!-- The condition works around https://github.com/dotnet/sdk/issues/44951 -->
-    <GlobalPackageReference Include="Nerdbank.GitVersioning" Version="3.8.118" Condition="!('$(TF_BUILD)'=='true' and '$(dotnetformat)'=='true')" />
+    <GlobalPackageReference Include="Nerdbank.GitVersioning" Version="3.9.50" Condition="!('$(TF_BUILD)'=='true' and '$(dotnetformat)'=='true')" />
     <GlobalPackageReference Include="PolySharp" Version="1.15.0" />
     <GlobalPackageReference Include="StyleCop.Analyzers.Unstable" Version="1.2.0.556" />
   </ItemGroup>