Reduce use of deprecated typing aliases (#6358)

stubs/waitress/waitress/adjustments.pyi

@@ -1,17 +1,17 @@
 from socket import socket
-from typing import Any, FrozenSet, Iterable, Sequence, Set
+from typing import Any, Iterable, Sequence
 
 from .compat import HAS_IPV6 as HAS_IPV6, PY2 as PY2, WIN as WIN, string_types as string_types
 from .proxy_headers import PROXY_HEADERS as PROXY_HEADERS
 
-truthy: FrozenSet[Any]
-KNOWN_PROXY_HEADERS: FrozenSet[Any]
+truthy: frozenset[Any]
+KNOWN_PROXY_HEADERS: frozenset[Any]
 
 def asbool(s: bool | str | int | None) -> bool: ...
 def asoctal(s: str) -> int: ...
 def aslist_cronly(value: str) -> list[str]: ...
 def aslist(value: str) -> list[str]: ...
-def asset(value: str | None) -> Set[str]: ...
+def asset(value: str | None) -> set[str]: ...
 def slash_fixed_str(s: str | None) -> str: ...
 def str_iftruthy(s: str | None) -> str | None: ...
 def as_socket_list(sockets: Sequence[object]) -> list[socket]: ...
@@ -27,7 +27,7 @@ class Adjustments:
     threads: int = ...
     trusted_proxy: str | None = ...
     trusted_proxy_count: int | None = ...
-    trusted_proxy_headers: Set[str] = ...
+    trusted_proxy_headers: set[str] = ...
     log_untrusted_proxy_headers: bool = ...
     clear_untrusted_proxy_headers: _bool_marker | bool = ...
     url_scheme: str = ...

stubs/waitress/waitress/proxy_headers.pyi

@@ -1,5 +1,5 @@
 from logging import Logger
-from typing import Any, Callable, Mapping, NamedTuple, Sequence, Set
+from typing import Any, Callable, Mapping, NamedTuple, Sequence
 
 from .utilities import BadRequest as BadRequest
 
@@ -21,14 +21,14 @@ def proxy_headers_middleware(
     app: Any,
     trusted_proxy: str | None = ...,
     trusted_proxy_count: int = ...,
-    trusted_proxy_headers: Set[str] | None = ...,
+    trusted_proxy_headers: set[str] | None = ...,
     clear_untrusted: bool = ...,
     log_untrusted: bool = ...,
     logger: Logger = ...,
 ) -> Callable[..., Any]: ...
 def parse_proxy_headers(
-    environ: Mapping[str, str], trusted_proxy_count: int, trusted_proxy_headers: Set[str], logger: Logger = ...
-) -> Set[str]: ...
+    environ: Mapping[str, str], trusted_proxy_count: int, trusted_proxy_headers: set[str], logger: Logger = ...
+) -> set[str]: ...
 def strip_brackets(addr: str) -> str: ...
 def clear_untrusted_headers(
     environ: Mapping[str, str], untrusted_headers: Sequence[str], log_warning: bool = ..., logger: Logger = ...

stubs/waitress/waitress/task.pyi

@@ -1,6 +1,7 @@
+from collections import deque
 from logging import Logger
 from threading import Condition, Lock
-from typing import Any, Deque, Mapping, Sequence
+from typing import Any, Mapping, Sequence
 
 from .channel import HTTPChannel
 from .utilities import Error
@@ -14,7 +15,7 @@ class ThreadedTaskDispatcher:
     logger: Logger = ...
     queue_logger: Logger = ...
     threads: set[Any] = ...
-    queue: Deque[Task] = ...
+    queue: deque[Task] = ...
     lock: Lock = ...
     queue_cv: Condition = ...
     thread_exit_cv: Condition = ...