Revert "Bump cherrypy from 18.8.0 to 18.9.0 (#2266)"

This reverts commit faef9a94c4.

lib/pydantic/warnings.py

@@ -1,58 +0,0 @@
-"""Pydantic-specific warnings."""
-from __future__ import annotations as _annotations
-
-from .version import version_short
-
-__all__ = 'PydanticDeprecatedSince20', 'PydanticDeprecationWarning'
-
-
-class PydanticDeprecationWarning(DeprecationWarning):
-    """A Pydantic specific deprecation warning.
-
-    This warning is raised when using deprecated functionality in Pydantic. It provides information on when the
-    deprecation was introduced and the expected version in which the corresponding functionality will be removed.
-
-    Attributes:
-        message: Description of the warning.
-        since: Pydantic version in what the deprecation was introduced.
-        expected_removal: Pydantic version in what the corresponding functionality expected to be removed.
-    """
-
-    message: str
-    since: tuple[int, int]
-    expected_removal: tuple[int, int]
-
-    def __init__(
-        self, message: str, *args: object, since: tuple[int, int], expected_removal: tuple[int, int] | None = None
-    ) -> None:
-        super().__init__(message, *args)
-        self.message = message.rstrip('.')
-        self.since = since
-        self.expected_removal = expected_removal if expected_removal is not None else (since[0] + 1, 0)
-
-    def __str__(self) -> str:
-        message = (
-            f'{self.message}. Deprecated in Pydantic V{self.since[0]}.{self.since[1]}'
-            f' to be removed in V{self.expected_removal[0]}.{self.expected_removal[1]}.'
-        )
-        if self.since == (2, 0):
-            message += f' See Pydantic V2 Migration Guide at https://errors.pydantic.dev/{version_short()}/migration/'
-        return message
-
-
-class PydanticDeprecatedSince20(PydanticDeprecationWarning):
-    """A specific `PydanticDeprecationWarning` subclass defining functionality deprecated since Pydantic 2.0."""
-
-    def __init__(self, message: str, *args: object) -> None:
-        super().__init__(message, *args, since=(2, 0), expected_removal=(3, 0))
-
-
-class PydanticDeprecatedSince26(PydanticDeprecationWarning):
-    """A specific `PydanticDeprecationWarning` subclass defining functionality deprecated since Pydantic 2.6."""
-
-    def __init__(self, message: str, *args: object) -> None:
-        super().__init__(message, *args, since=(2, 0), expected_removal=(3, 0))
-
-
-class GenericBeforeBaseModelWarning(Warning):
-    pass