Changed from list to abstract Sequence type for http verbs (#415)

* Changed from list to abstract Sequence type for http verbs

Allows method decorator to not fail on tuple, as there is no reason to
have `methods` mutable

* [pre-commit.ci] auto fixes from pre-commit.com hooks

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

rest_framework-stubs/decorators.pyi

@@ -29,7 +29,7 @@ class MethodMapper(dict):
     def options(self, func: _View) -> _View: ...
     def trace(self, func: _View) -> _View: ...
 
-_LOWER_CASE_HTTP_VERBS: TypeAlias = list[
+_LOWER_CASE_HTTP_VERBS: TypeAlias = Sequence[
     Literal[
         "get",
         "post",
@@ -42,7 +42,7 @@ _LOWER_CASE_HTTP_VERBS: TypeAlias = list[
     ]
 ]
 
-_MIXED_CASE_HTTP_VERBS: TypeAlias = list[
+_MIXED_CASE_HTTP_VERBS: TypeAlias = Sequence[
     Literal[
         "GET",
         "POST",

tests/typecheck/test_decorators.yml

@@ -41,3 +41,16 @@
         permission_classes([IsAuthenticated & Permission])
         permission_classes([IsAuthenticated | Permission])
         permission_classes([~Permission])
+
+- case: method_decorator
+  main: |
+    from rest_framework import viewsets
+    from rest_framework.decorators import action
+
+    class MyView(viewsets.ViewSet):
+
+      @action(methods=("get",), detail=False)
+      def view_func_1(request): ...
+
+      @action(methods=["post",], detail=False)
+      def view_func_2(request): ...