Fixes to curses stubs (#6620)

stdlib/_curses.pyi

@@ -1,5 +1,6 @@
 import sys
-from typing import IO, Any, BinaryIO, NamedTuple, Union, overload
+from _typeshed import SupportsRead
+from typing import IO, Any, NamedTuple, Union, overload
 
 _chtype = Union[str, bytes, int]
 
@@ -293,9 +294,14 @@ def erasechar() -> bytes: ...
 def filter() -> None: ...
 def flash() -> None: ...
 def flushinp() -> None: ...
+
+if sys.version_info >= (3, 9):
+    def get_escdelay() -> int: ...
+    def get_tabsize() -> int: ...
+
 def getmouse() -> tuple[int, int, int, int, int]: ...
 def getsyx() -> tuple[int, int]: ...
-def getwin(__file: BinaryIO) -> _CursesWindow: ...
+def getwin(__file: SupportsRead[bytes]) -> _CursesWindow: ...
 def halfdelay(__tenths: int) -> None: ...
 def has_colors() -> bool: ...
 
@@ -337,6 +343,11 @@ def resetty() -> None: ...
 def resize_term(__nlines: int, __ncols: int) -> None: ...
 def resizeterm(__nlines: int, __ncols: int) -> None: ...
 def savetty() -> None: ...
+
+if sys.version_info >= (3, 9):
+    def set_escdelay(__ms: int) -> None: ...
+    def set_tabsize(__size: int) -> None: ...
+
 def setsyx(__y: int, __x: int) -> None: ...
 def setupterm(term: str | None = ..., fd: int = ...) -> None: ...
 def start_color() -> None: ...
@@ -344,7 +355,7 @@ def termattrs() -> int: ...
 def termname() -> bytes: ...
 def tigetflag(__capname: str) -> int: ...
 def tigetnum(__capname: str) -> int: ...
-def tigetstr(__capname: str) -> bytes: ...
+def tigetstr(__capname: str) -> bytes | None: ...
 def tparm(
     __str: bytes,
     __i1: int = ...,
@@ -362,7 +373,7 @@ def unctrl(__ch: _chtype) -> bytes: ...
 def unget_wch(__ch: int | str) -> None: ...
 def ungetch(__ch: _chtype) -> None: ...
 def ungetmouse(__id: int, __x: int, __y: int, __z: int, __bstate: int) -> None: ...
-def update_lines_cols() -> int: ...
+def update_lines_cols() -> None: ...
 def use_default_colors() -> None: ...
 def use_env(__flag: bool) -> None: ...