refs or cleanup

src/.editorconfig

@@ -189,7 +189,7 @@ resharper_arrange_object_creation_when_type_evident_highlighting = error
 resharper_arrange_object_creation_when_type_not_evident_highlighting = error
 resharper_arrange_redundant_parentheses_highlighting = error
 resharper_arrange_static_member_qualifier_highlighting = error
-resharper_arrange_this_qualifier_highlighting = hint
+resharper_arrange_this_qualifier_highlighting = error
 resharper_arrange_type_member_modifiers_highlighting = none
 resharper_built_in_type_reference_style_for_member_access_highlighting = hint
 resharper_built_in_type_reference_style_highlighting = hint
@@ -232,11 +232,11 @@ dotnet_style_predefined_type_for_locals_parameters_members = true:error
 dotnet_style_predefined_type_for_member_access = true:error
 
 # Suggest more modern language features when available
-dotnet_style_object_initializer = true:suggestion
-dotnet_style_collection_initializer = true:suggestion
-dotnet_style_coalesce_expression = false:suggestion
-dotnet_style_null_propagation = true:suggestion
-dotnet_style_explicit_tuple_names = true:suggestion
+dotnet_style_object_initializer = true:error
+dotnet_style_collection_initializer = true:error
+dotnet_style_coalesce_expression = false:error
+dotnet_style_null_propagation = true:error
+dotnet_style_explicit_tuple_names = true:error
 
 # Prefer "var" everywhere
 csharp_style_var_for_built_in_types = true:error

src/Directory.Packages.props

@@ -10,12 +10,12 @@
     <PackageVersion Include="NodaTime" Version="3.1.11" />
     <PackageVersion Include="NUnit" Version="4.1.0" />
     <PackageVersion Include="NUnit3TestAdapter" Version="4.5.0" />
-    <PackageVersion Include="Polyfill" Version="5.5.2" />
+    <PackageVersion Include="Polyfill" Version="6.0.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.131" />
     <PackageVersion Include="System.Collections.Immutable" Version="8.0.0" />
     <PackageVersion Include="System.IO.Compression" Version="4.3.0" />
-    <PackageVersion Include="Verify" Version="25.0.2" />
+    <PackageVersion Include="Verify" Version="25.3.2" />
     <PackageVersion Include="Verify.MailMessage" Version="1.1.0" />
-    <PackageVersion Include="Verify.NUnit" Version="25.0.2" />
+    <PackageVersion Include="Verify.NUnit" Version="25.3.2" />
   </ItemGroup>
 </Project>