[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

src/structlog/_frames.py

@@ -15,6 +15,7 @@
 from .contextvars import _ASYNC_CALLING_STACK
 from .typing import ExcInfo
 
+
 def is_missing_exc_info(exc_info: ExcInfo) -> bool:
     """
     Return True if exc_info is the missing value.

src/structlog/tracebacks.py

@@ -24,6 +24,7 @@
 
 from ._frames import is_missing_exc_info
 
+
 try:
     import rich
     import rich.pretty