Remove deprecated lint rules for turms-client-dart

Author: JamesChenX

turms-client-dart/analysis_options.yaml

@@ -15,7 +15,6 @@ linter:
   rules:
     - always_declare_return_types
     - always_put_control_body_on_new_line
-    - always_require_non_null_named_parameters
     - annotate_overrides
     - avoid_bool_literals_in_conditional_expressions
     - avoid_catching_errors
@@ -32,7 +31,6 @@ linter:
     - avoid_relative_lib_imports
     - avoid_renaming_method_parameters
     - avoid_return_types_on_setters
-    - avoid_returning_null_for_future
     - avoid_returning_null_for_void
     - avoid_returning_this
     - avoid_shadowing_type_parameters