Add Server to asyncio.base_events' __all__ (#7554)

Add Server to asyncio.base_events' __all__

Closes #7552

stdlib/asyncio/base_events.pyi

@@ -14,6 +14,9 @@ from typing_extensions import Literal
 if sys.version_info >= (3, 7):
     from contextvars import Context
 
+if sys.version_info >= (3, 9):
+    __all__ = ("BaseEventLoop", "Server")
+elif sys.version_info >= (3, 7):
     __all__ = ("BaseEventLoop",)
 else:
     __all__ = ["BaseEventLoop"]

tests/stubtest_allowlists/py310.txt

@@ -33,10 +33,12 @@ ast.Index.__new__
 ast.NameConstant.__new__
 ast.Num.__new__
 ast.Str.__new__
+asyncio.base_events.__all__  # Fixed in 3.10.3
 asyncio.Future.__init__  # Usually initialized from c object
 asyncio.Future._callbacks  # Usually initialized from c object
 asyncio.futures.Future.__init__  # Usually initialized from c object
 asyncio.futures.Future._callbacks  # Usually initialized from c object
+asyncio.Server  # Fixed in 3.10.3
 builtins.dict.get
 builtins.float.__set_format__  # Internal method for CPython test suite
 builtins.property.__set_name__  # Doesn't actually exist

tests/stubtest_allowlists/py39.txt

@@ -15,10 +15,12 @@ ast.Index.__new__
 ast.NameConstant.__new__
 ast.Num.__new__
 ast.Str.__new__
+asyncio.base_events.__all__  # Fixed in 3.9.11
 asyncio.Future.__init__  # Usually initialized from c object
 asyncio.Future._callbacks  # Usually initialized from c object
 asyncio.futures.Future.__init__  # Usually initialized from c object
 asyncio.futures.Future._callbacks  # Usually initialized from c object
+asyncio.Server  # Fixed in 3.9.11
 builtins.dict.get
 builtins.float.__set_format__  # Internal method for CPython test suite
 collections.AsyncGenerator.asend  # async at runtime, deliberately not in the stub, see #7491. Pos-only differences also.