Update StyleCop to 1.2.0-beta.406.

Author: bgrainger

.editorconfig

@@ -97,6 +97,7 @@ dotnet_diagnostic.SA1303.severity = none # Const fields should begin with upper-
 dotnet_diagnostic.SA1308.severity = none # Variable names should not be prefixed.
 dotnet_diagnostic.SA1310.severity = none # Field name should not contain an underscore.
 dotnet_diagnostic.SA1311.severity = none # Static readonly fields should begin with upper-case letter.
+dotnet_diagnostic.SA1402.severity = silent # File may only contain a single type.
 dotnet_diagnostic.SA1407.severity = none # Arithmetic expressions must declare precedence.
 dotnet_diagnostic.SA1408.severity = none # Conditional expressions should declare precedence.
 dotnet_diagnostic.SA1500.severity = none # Braces for multi-line statements should not share line.
@@ -112,3 +113,4 @@ dotnet_diagnostic.SA1623.severity = none # 	Property summary documentation shoul
 dotnet_diagnostic.SA1629.severity = none # Documentation text should end with a period.
 dotnet_diagnostic.SA1633.severity = none # File should have header.
 dotnet_diagnostic.SA1642.severity = none # Constructor summary documentation should begin with standard text.
+dotnet_diagnostic.SA1649.severity = silent # File name should match first type name

src/Directory.Build.props

@@ -33,7 +33,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.376">
+    <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.406">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>