Log Message:
py-structlog: updated to 21.1.0

21.1.0 (2021-02-18)
Changes:
- ``structlog.threadlocal.wrap_dict()`` now has a correct type annotation.
- Fix isolation in ``structlog.contextvars``.
- The default configuration and loggers are pickleable again.
- ``structlog.dev.ConsoleRenderer`` will now look for a ``logger_name`` key if no
  ``logger`` key is set.