refs or cleanup

Author: SimonCropp

src/.editorconfig

@@ -272,6 +272,9 @@ dotnet_style_coalesce_expression = false:error
 dotnet_style_null_propagation = true:error
 dotnet_style_explicit_tuple_names = true:error
 
+# Use collection expression syntax
+resharper_use_collection_expression_highlighting = error
+
 # Prefer "var" everywhere
 csharp_style_var_for_built_in_types = true:error
 csharp_style_var_when_type_is_apparent = true:error

src/global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "9.0.300",
+    "version": "9.0.301",
     "allowPrerelease": true,
     "rollForward": "latestFeature"
   }