Bump NuGet.Versioning from 6.11.1 to 6.12.1 in /src

Bumps [NuGet.Versioning](https://github.com/NuGet/NuGet.Client) from 6.11.1 to 6.12.1.
- [Release notes](https://github.com/NuGet/NuGet.Client/releases)
- [Commits](https://github.com/NuGet/NuGet.Client/commits)

---
updated-dependencies:
- dependency-name: NuGet.Versioning
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

src/Directory.Packages.props

@@ -47,7 +47,7 @@
     <PackageVersion Include="NServiceBus.Transport.Msmq.Sources" Version="3.0.1" />
     <PackageVersion Include="NServiceBus.Transport.SqlServer" Version="8.1.6" />
     <PackageVersion Include="NServiceBus.Transport.PostgreSql" Version="8.1.6" />
-    <PackageVersion Include="NuGet.Versioning" Version="6.11.1" />
+    <PackageVersion Include="NuGet.Versioning" Version="6.12.1" />
     <PackageVersion Include="NUnit" Version="4.2.2" />
     <PackageVersion Include="NUnit.Analyzers" Version="4.3.0" />
     <PackageVersion Include="NUnit3TestAdapter" Version="4.6.0" />