Delete yaml.CDangerLoader and yaml.CDangerDumper (#5990)

These no longer exist in PyYAML 4.2.

stubs/PyYAML/@tests/stubtest_allowlist.txt

@@ -1,12 +1,8 @@
 yaml.CBaseDumper.__init__
-yaml.CDangerDumper
-yaml.CDangerLoader
 yaml.CDumper.__init__
 yaml.CEmitter
 yaml.CParser
 yaml.YAMLObjectMetaclass.__init__
 yaml.constructor.FullConstructor.set_python_instance_state
 yaml.cyaml.CBaseDumper.__init__
-yaml.cyaml.CDangerDumper
-yaml.cyaml.CDangerLoader
 yaml.cyaml.CDumper.__init__

stubs/PyYAML/yaml/cyaml.pyi

@@ -1,12 +1,11 @@
 from _typeshed import SupportsRead
 from typing import IO, Any, Mapping, Sequence, Text, Union
 
-from yaml.constructor import BaseConstructor, Constructor, FullConstructor, SafeConstructor, UnsafeConstructor
+from yaml.constructor import BaseConstructor, FullConstructor, SafeConstructor, UnsafeConstructor
 from yaml.events import Event
 from yaml.nodes import Node
-from yaml.representer import BaseRepresenter, Representer, SafeRepresenter
+from yaml.representer import BaseRepresenter, SafeRepresenter
 from yaml.resolver import BaseResolver, Resolver
-from yaml.serializer import Serializer
 from yaml.tokens import Token
 
 _Readable = SupportsRead[Union[Text, bytes]]
@@ -39,8 +38,6 @@ class CFullLoader(CParser, FullConstructor, Resolver):
 class CUnsafeLoader(CParser, UnsafeConstructor, Resolver):
     def __init__(self, stream: str | bytes | _Readable) -> None: ...
 
-class CDangerLoader(CParser, Constructor, Resolver): ...  # undocumented
-
 class CEmitter(object):
     def __init__(
         self,
@@ -78,5 +75,3 @@ class CBaseDumper(CEmitter, BaseRepresenter, BaseResolver):
 class CDumper(CEmitter, SafeRepresenter, Resolver): ...
 
 CSafeDumper = CDumper
-
-class CDangerDumper(CEmitter, Serializer, Representer, Resolver): ...  # undocumented