Fix exception types for jsonschema._format (#7990)

The annotated type for the `raises` argument on format checkers was

    Exception | tuple[Exception, ...]

when it should read

    type[Exception] | tuple[type[Exception], ...]

Co-authored-by: Sebastian Rittau <[email protected]>

Author: sirosen

stubs/jsonschema/jsonschema/_format.pyi

@@ -1,15 +1,17 @@
 from collections.abc import Callable, Iterable
-from typing import Any, TypeVar
+from typing import Any, TypeVar, Union
+from typing_extensions import TypeAlias
 
 _F = TypeVar("_F", bound=Callable[..., Any])
+_RaisesType: TypeAlias = Union[type[Exception], tuple[type[Exception], ...]]
 
 class FormatChecker:
-    checkers: dict[str, tuple[Callable[[Any], bool], Exception | tuple[Exception, ...]]]
+    checkers: dict[str, tuple[Callable[[Any], bool], _RaisesType]]
 
     def __init__(self, formats: Iterable[str] | None = ...) -> None: ...
-    def checks(self, format: str, raises: Exception | tuple[Exception, ...] = ...) -> Callable[[_F], _F]: ...
+    def checks(self, format: str, raises: _RaisesType = ...) -> Callable[[_F], _F]: ...
     @classmethod
-    def cls_checks(cls, format: str, raises: Exception | tuple[Exception, ...] = ...) -> Callable[[_F], _F]: ...
+    def cls_checks(cls, format: str, raises: _RaisesType = ...) -> Callable[[_F], _F]: ...
     def check(self, instance: Any, format: str) -> None: ...
     def conforms(self, instance: Any, format: str) -> bool: ...