Bump NuGet.Protocol from 5.8.1 to 5.9.3 in /eng/tools/BaselineGenerator (#44480)

Bumps [NuGet.Protocol](https://github.com/NuGet/NuGet.Client) from 5.8.1 to 5.9.3.
- [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]>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

eng/tools/BaselineGenerator/BaselineGenerator.csproj

@@ -8,7 +8,7 @@
 
   <ItemGroup>
     <Compile Include="$(SharedSourceRoot)CommandLineUtils\**\*.cs" />
-    <PackageReference Include="NuGet.Protocol" Version="5.8.1" />
+    <PackageReference Include="NuGet.Protocol" Version="5.9.3" />
   </ItemGroup>
 
 </Project>