Bump NuGet.Protocol from 6.4.0 to 6.4.2 in /src/NugetVersion

Bumps [NuGet.Protocol](https://github.com/NuGet/NuGet.Client) from 6.4.0 to 6.4.2.
- [Release notes](https://github.com/NuGet/NuGet.Client/releases)
- [Commits](https://github.com/NuGet/NuGet.Client/commits)

---
updated-dependencies:
- dependency-name: NuGet.Protocol
  dependency-type: direct:production
...

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

Author: dependabot[bot]

src/NugetVersion/NugetVersion.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
@@ -22,7 +22,7 @@
     <PackageReference Include="McMaster.Extensions.CommandLineUtils" Version="4.0.2" />
     <PackageReference Include="Microsoft.Extensions.Logging" Version="6.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="6.0.0" />
-    <PackageReference Include="NuGet.Protocol" Version="6.4.0" />
+    <PackageReference Include="NuGet.Protocol" Version="6.4.2" />
   </ItemGroup>
 
   <ItemGroup>