refactor: improve more type signatures

- inherited(base) now typed as T.class_of(Plugin) instead of T.untyped
- raw_hash now typed as T::Hash[String, T.untyped] since YAML produces string keys

Author: joemsak

lib/code_teams.rb

@@ -85,7 +85,7 @@ def self.from_yml(config_yml)
       )
     end
 
-    sig { params(raw_hash: T::Hash[T.untyped, T.untyped]).returns(Team) }
+    sig { params(raw_hash: T::Hash[String, T.untyped]).returns(Team) }
     def self.from_hash(raw_hash)
       new(
         config_yml: nil,
@@ -104,7 +104,7 @@ def self.register_plugins
       end
     end
 
-    sig { returns(T::Hash[T.untyped, T.untyped]) }
+    sig { returns(T::Hash[String, T.untyped]) }
     attr_reader :raw_hash
 
     sig { returns(T.nilable(String)) }
@@ -113,7 +113,7 @@ def self.register_plugins
     sig do
       params(
         config_yml: T.nilable(String),
-        raw_hash: T::Hash[T.untyped, T.untyped]
+        raw_hash: T::Hash[String, T.untyped]
       ).void
     end
     def initialize(config_yml:, raw_hash:)

lib/code_teams/plugin.rb

@@ -28,9 +28,9 @@ def self.default_data_accessor_name
       Utils.underscore(Utils.demodulize(T.must(name)))
     end
 
-    sig { params(base: T.untyped).void }
+    sig { params(base: T.class_of(Plugin)).void }
     def self.inherited(base) # rubocop:disable Lint/MissingSuper
-      all_plugins << T.cast(base, T.class_of(Plugin))
+      all_plugins << base
     end
 
     sig { returns(T::Array[T.class_of(Plugin)]) }