typing.TypeVarTuple: add bound/variance properties from 3.15

Author: KotlinIsland

stdlib/typing.pyi

@@ -257,6 +257,15 @@ if sys.version_info >= (3, 11):
     class TypeVarTuple:
         @property
         def __name__(self) -> str: ...
+        if sys.version_info >= (3, 15):
+            @property
+            def __bound__(self) -> Any | None: ...  # AnnotationForm
+            @property
+            def __covariant__(self) -> bool: ...
+            @property
+            def __contravariant__(self) -> bool: ...
+            @property
+            def __infer_variance__(self) -> bool: ...
         if sys.version_info >= (3, 13):
             @property
             def __default__(self) -> Any: ...  # AnnotationForm