Add __setattr__ to logging.LogRecord (#8064)

stdlib/logging/__init__.pyi

@@ -413,6 +413,8 @@ class LogRecord:
         sinfo: str | None = ...,
     ) -> None: ...
     def getMessage(self) -> str: ...
+    # Allows setting contextual information on LogRecord objects as per the docs, see #7833
+    def __setattr__(self, __name: str, __value: Any) -> None: ...
 
 _L = TypeVar("_L", bound=Logger | LoggerAdapter[Any])