Add jsonschema.protocols to library stubs (#6614)

`jsonschema.protocols.Validator` was introduced in `jsonschema` v4.3.0
It's also available under the name `jsonschema.Validator`.

stubs/jsonschema/METADATA.toml

@@ -1 +1 @@
-version = "4.2.*"
+version = "4.3.*"

stubs/jsonschema/jsonschema/__init__.pyi

@@ -15,6 +15,7 @@ from jsonschema.exceptions import (
     SchemaError as SchemaError,
     ValidationError as ValidationError,
 )
+from jsonschema.protocols import Validator as Validator
 from jsonschema.validators import (
     Draft3Validator as Draft3Validator,
     Draft4Validator as Draft4Validator,

stubs/jsonschema/jsonschema/protocols.pyi

@@ -0,0 +1,22 @@
+from typing import Any, ClassVar, Iterator, Protocol
+
+from jsonschema._format import FormatChecker
+from jsonschema._types import TypeChecker
+from jsonschema.exceptions import ValidationError
+from jsonschema.validators import RefResolver
+
+class Validator(Protocol):
+    META_SCHEMA: ClassVar[dict[Any, Any]]
+    VALIDATORS: ClassVar[dict[Any, Any]]
+    TYPE_CHECKER: ClassVar[TypeChecker]
+    schema: dict[Any, Any] | bool
+    def __init__(
+        self, schema: dict[Any, Any] | bool, resolver: RefResolver | None = ..., format_checker: FormatChecker | None = ...
+    ) -> None: ...
+    @classmethod
+    def check_schema(cls, schema: dict[Any, Any]) -> None: ...
+    def is_type(self, instance: Any, type: str) -> bool: ...
+    def is_valid(self, instance: dict[Any, Any]) -> bool: ...
+    def iter_errors(self, instance: dict[Any, Any]) -> Iterator[ValidationError]: ...
+    def validate(self, instance: dict[Any, Any]) -> None: ...
+    def evolve(self, **kwargs) -> "Validator": ...