Update README.md

updated readme with the new nerdbank bank version

Author: varndellwagglebee

README.md

@@ -270,7 +270,7 @@ jobs:
   <!-- Shared package refs -->
   <ItemGroup>
     <!-- NBGV drives versions; PrivateAssets=all keeps it out of consumers -->
-    <PackageReference Include="Nerdbank.GitVersioning" Version="3.8.38-alpha" PrivateAssets="all" />
+    <PackageReference Include="Nerdbank.GitVersioning" Version="3.9.50" PrivateAssets="all" />
     <!-- SourceLink for GitHub -->
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0">
       <PrivateAssets>all</PrivateAssets>
@@ -318,4 +318,4 @@ jobs:
 - `set_version.yml` **pushes** `version.json`. Ensure branch protections allow workflow pushes (or switch it to open a PR).
 - Tag is always `v<NuGetPackageVersion>`. Releases are created as **draft** by default.
 - For prereleases (develop/hotfix),  **Nerdbank.GitVersioning** baseline is `-alpha`; `main` is **always stable**.
-- NuGet push uses `--skip-duplicate` to keep reruns green.
+- NuGet push uses `--skip-duplicate` to keep reruns green.