Bump flake8 version

Fixes support for importlib_metadata 5.0.0,
https://github.com/PyCQA/flake8/issues/1701

.pre-commit-config.yaml

@@ -13,7 +13,7 @@ repos:
       - id: isort
 
   - repo: https://gitlab.com/pycqa/flake8
-    rev: 3.8.3
+    rev: 5.0.4
     hooks:
       - id: flake8
 

irctest/controllers/sopel.py

@@ -39,7 +39,7 @@ class SopelController(BaseClientController):
         if self.filename:
             try:
                 (Path("~/.sopel/").expanduser() / self.filename).unlink()
-            except OSError:  #  File does not exist
+            except OSError:  # File does not exist
                 pass
 
     def open_file(self, filename: str, mode: str = "a") -> TextIO: