Bump Microsoft.VisualStudio.Threading.Analyzers

Bumps [Microsoft.VisualStudio.Threading.Analyzers](https://github.com/microsoft/vs-threading) from 17.10.48 to 17.11.20.
- [Release notes](https://github.com/microsoft/vs-threading/releases)
- [Commits](https://github.com/microsoft/vs-threading/commits)

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

Signed-off-by: dependabot[bot] <support@github.com>

Sideways.Tests/Sideways.Tests.csproj

@@ -22,7 +22,7 @@
   <ItemGroup Condition="'$(BuildingInsideVisualStudio)' == 'true'">
     <PackageReference Include="Gu.Analyzers" Version="2.0.3" PrivateAssets="all" />
     <PackageReference Include="IDisposableAnalyzers" Version="4.0.8" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.10.48" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.11.20" PrivateAssets="all" />
     <PackageReference Include="PropertyChangedAnalyzers" Version="4.0.0" PrivateAssets="all" />
     <PackageReference Include="ReflectionAnalyzers" Version="0.3.1" PrivateAssets="all" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.556" PrivateAssets="all" />

Sideways/Sideways.csproj

@@ -44,7 +44,7 @@
   <ItemGroup Condition="'$(BuildingInsideVisualStudio)' == 'true'">
     <PackageReference Include="Gu.Analyzers" Version="2.0.3" PrivateAssets="all" />
     <PackageReference Include="IDisposableAnalyzers" Version="4.0.8" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.10.48" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.11.20" PrivateAssets="all" />
     <PackageReference Include="PropertyChangedAnalyzers" Version="4.0.0" PrivateAssets="all" />
     <PackageReference Include="ReflectionAnalyzers" Version="0.3.1" PrivateAssets="all" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.556" PrivateAssets="all" />