Exclude CA1861

The analyzer is probably right, but the fix would be a named static field, which would reduce code locality. As I don't think these places are hot-paths, we prefer code locality over _potential_ performance increase.

Right now it triggered in these members:
* ObjectReference.GetPathElements
* StringExtensions.IndentLines
* MemberPath.Segments

.editorconfig

@@ -154,6 +154,8 @@ dotnet_diagnostic.CA1819.severity = none
 dotnet_diagnostic.CA1851.severity = suggestion
 # CA1860: Avoid using 'Enumerable.Any()' extension method
 dotnet_diagnostic.CA1860.severity = warning
+# CA1861: Avoid constant arrays as arguments
+dotnet_diagnostic.CA1861.severity = none
 # CA2007: Do not directly await a Task
 dotnet_diagnostic.CA2007.severity = none
 # CA2225: Operator overloads have named alternates