Remove flynt as a local pre-commit hook

`pyupgrade` upgrades `%` and `.format()` usage to f-strings.

.pre-commit-config.yaml

@@ -17,12 +17,6 @@ repos:
 
   - repo: local
     hooks:
-      - id: flynt
-        name: Convert to f-strings with flynt
-        entry: flynt
-        language: python
-        additional_dependencies: ['flynt==0.76']
-
       - id: black
         name: black
         entry: black