[main] Bump StreamJsonRpc and Microsoft.VisualStudio.Threading.Analyzers

Bumps [StreamJsonRpc](https://github.com/microsoft/vs-streamjsonrpc) and [Microsoft.VisualStudio.Threading.Analyzers](https://github.com/microsoft/vs-threading). These dependencies needed to be updated together.

Updates `StreamJsonRpc` from 2.20.17 to 2.20.20
- [Release notes](https://github.com/microsoft/vs-streamjsonrpc/releases)
- [Commits](https://github.com/microsoft/vs-streamjsonrpc/commits)

Updates `Microsoft.VisualStudio.Threading.Analyzers` from 17.12.19 to 17.10.48
- [Release notes](https://github.com/microsoft/vs-threading/releases)
- [Commits](https://github.com/microsoft/vs-threading/commits/v17.10.48)

---
updated-dependencies:
- dependency-name: StreamJsonRpc
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: Microsoft.VisualStudio.Threading.Analyzers
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Directory.Packages.props

@@ -76,7 +76,7 @@
     <PackageVersion Include="Polly" Version="8.4.2" />
     <PackageVersion Include="Polly.Contrib.WaitAndRetry" Version="1.1.1" />
     <PackageVersion Include="ReportGenerator" Version="4.3.6" />
-    <PackageVersion Include="StreamJsonRpc" Version="2.20.17" />
+    <PackageVersion Include="StreamJsonRpc" Version="2.20.20" />
     <PackageVersion Include="StrongNamer" Version="0.2.5" />
     <PackageVersion Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
     <PackageVersion Include="System.Management" Version="9.0.0" />