Fix stdlib stubtest on Python 3.14.9 and 3.15.1 (#16596)

Author: AlexWaygood

stdlib/_remote_debugging.pyi

@@ -156,6 +156,9 @@ class BinaryWriter:
     ) -> None: ...
     @property
     def total_samples(self) -> int: ...
+    # Added in Python 3.15.1.
+    @property
+    def limit_reached(self) -> bool: ...
     def write_sample(self, stack_frames: list[InterpreterInfo], timestamp_us: int) -> None: ...
     def set_stats(
         self, /, duration_sec: float, sample_rate: float, error_rate: float | None = None, missed_samples: float | None = None

stdlib/email/_header_value_parser.pyi

@@ -47,6 +47,10 @@ class TokenList(list[TokenList | Terminal]):
     def as_ew_allowed(self) -> bool: ...
     @property
     def comments(self) -> list[str]: ...
+    if sys.version_info >= (3, 14):
+        # Added in Python 3.14.9 and 3.15.1.
+        def contains_token_type(self, *token_types: str | None) -> bool: ...
+
     def fold(self, *, policy: Policy) -> str: ...
     def pprint(self, indent: str = "") -> None: ...
     def ppstr(self, indent: str = "") -> str: ...
@@ -339,6 +343,10 @@ class Terminal(str):
     def pop_trailing_ws(self) -> None: ...
     @property
     def comments(self) -> list[str]: ...
+    if sys.version_info >= (3, 14):
+        # Added in Python 3.14.9 and 3.15.1.
+        def contains_token_type(self, *token_types: str | None) -> bool: ...
+
     def __getnewargs__(self) -> tuple[str, str]: ...  # type: ignore[override]
 
 class WhiteSpaceTerminal(Terminal):

stdlib/multiprocessing/context.pyi

@@ -169,7 +169,12 @@ class Process(BaseProcess):
 
 class DefaultContext(BaseContext):
     Process: ClassVar[type[Process]]
-    def __init__(self, context: BaseContext) -> None: ...
+    if sys.version_info >= (3, 14):
+        # The context parameter became optional in Python 3.14.9 and 3.15.1.
+        def __init__(self, context: BaseContext | None = None) -> None: ...
+    else:
+        def __init__(self, context: BaseContext) -> None: ...
+
     def get_start_method(self, allow_none: bool = False) -> str: ...
     def get_all_start_methods(self) -> list[str]: ...