Bump Nerdbank.GitVersioning from 3.7.115 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] <support@github.com>

Author: dependabot[bot]

net8/Directory.Build.props

@@ -3,7 +3,7 @@
   <ItemGroup>
     <PackageReference Include="Nerdbank.GitVersioning" Condition="!Exists('packages.config')">
       <PrivateAssets>all</PrivateAssets>
-      <Version>3.7.115</Version>
+      <Version>3.9.50</Version>
     </PackageReference>
   </ItemGroup>
 </Project>