making parse_file untyped

Author: robaiken

cargo/lib/dependabot/cargo/file_parser.rb

@@ -375,9 +375,9 @@ def check_required_files
         raise "No Cargo.toml!" unless get_original_file("Cargo.toml")
       end
 
-      sig { params(file: DependencyFile).returns(T::Hash[String, T.untyped]) }
+      sig { params(file: DependencyFile).returns(T.untyped) }
       def parsed_file(file)
-        @parsed_file ||= T.let({}, T.nilable(T::Hash[String, T.untyped]))
+        @parsed_file ||= T.let({}, T.untyped)
         @parsed_file[file.name] ||= TomlRB.parse(file.content)
       rescue TomlRB::ParseError, TomlRB::ValueOverwriteError
         raise Dependabot::DependencyFileNotParseable, file.path