Mark stub-only private symbols as @type_check_only in third-party stubs (#14545)

stubs/docker/docker/models/containers.pyi

@@ -1,7 +1,7 @@
 import datetime
 from _typeshed import Incomplete
 from collections.abc import Iterable, Mapping
-from typing import Literal, NamedTuple, TypedDict, overload
+from typing import Literal, NamedTuple, TypedDict, overload, type_check_only
 from typing_extensions import NotRequired
 
 from docker._types import ContainerWeightDevice, WaitContainerResponse
@@ -13,6 +13,7 @@ from docker.types.services import Mount
 from .images import Image
 from .resource import Collection, Model
 
+@type_check_only
 class _RestartPolicy(TypedDict):
     MaximumRetryCount: NotRequired[int]
     Name: NotRequired[Literal["always", "on-failure"]]

stubs/docker/docker/utils/proxy.pyi

@@ -1,13 +1,15 @@
 from collections.abc import Sequence
-from typing import TypedDict
+from typing import TypedDict, type_check_only
 from typing_extensions import NotRequired
 
+@type_check_only
 class _ProxyConfigDict(TypedDict):
     http: NotRequired[str]
     https: NotRequired[str]
     ftpProxy: NotRequired[str]
     noProxy: NotRequired[str]
 
+@type_check_only
 class _Environment(TypedDict):
     http_proxy: NotRequired[str]
     HTTP_PROXY: NotRequired[str]