Remove Python 3.7 branches (#11238)

stdlib/io.pyi

@@ -12,6 +12,7 @@ from typing_extensions import Literal, Self
 __all__ = [
     "BlockingIOError",
     "open",
+    "open_code",
     "IOBase",
     "RawIOBase",
     "FileIO",
@@ -30,9 +31,6 @@ __all__ = [
     "SEEK_END",
 ]
 
-if sys.version_info >= (3, 8):
-    __all__ += ["open_code"]
-
 if sys.version_info >= (3, 11):
     __all__ += ["DEFAULT_BUFFER_SIZE", "IncrementalNewlineDecoder", "text_encoding"]
 
@@ -46,8 +44,7 @@ SEEK_END: Literal[2]
 
 open = builtins.open
 
-if sys.version_info >= (3, 8):
-    def open_code(path: str) -> IO[bytes]: ...
+def open_code(path: str) -> IO[bytes]: ...
 
 BlockingIOError = builtins.BlockingIOError