Enable redundant-self mypy error code (#11056)

Author: sobolevn

stdlib/zipfile.pyi

@@ -233,7 +233,7 @@ if sys.version_info >= (3, 8):
         def make(cls, source: ZipFile) -> CompleteDirs: ...
         @overload
         @classmethod
-        def make(cls: type[Self], source: StrPath | IO[bytes]) -> Self: ...
+        def make(cls, source: StrPath | IO[bytes]) -> Self: ...
 
     class Path:
         root: CompleteDirs

tests/mypy_test.py

@@ -268,6 +268,8 @@ def run_mypy(
             "--allow-subclassing-any",
             "--enable-error-code",
             "ignore-without-code",
+            "--enable-error-code",
+            "redundant-self",
             "--config-file",
             temp.name,
         ]

tests/typecheck_typeshed.py

@@ -63,6 +63,8 @@ def run_mypy_as_subprocess(directory: str, platform: str, version: str) -> Retur
         "possibly-undefined",
         "--enable-error-code",
         "redundant-expr",
+        "--enable-error-code",
+        "redundant-self",
         "--custom-typeshed-dir",
         ".",
     ]