[pre-commit.ci] pre-commit autoupdate (#123)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -21,7 +21,7 @@ repos:
     hooks:
       - id: isort
   - repo: https://github.com/psf/black
-    rev: 21.11b1
+    rev: 21.12b0
     hooks:
       - id: black
         args: [ --safe ]

src/filelock/_unix.py

@@ -12,7 +12,6 @@
     class UnixFileLock(BaseFileLock, ABC):
         """Uses the :func:`fcntl.flock` to hard lock the lock file on unix systems."""
 
-
 else:  # pragma: win32 no cover
     try:
         import fcntl

src/filelock/_windows.py

@@ -45,7 +45,6 @@ def _release(self) -> None:
             except OSError:
                 pass
 
-
 else:  # pragma: win32 no cover
 
     class WindowsFileLock(BaseFileLock, ABC):