test: don't run flake against tests

Part-of: <!58>

.pre-commit-config.yaml

@@ -43,6 +43,7 @@ repos:
     rev: 6.0.0
     hooks:
       - id: flake8
+        exclude: ^tests
 
   - repo: https://github.com/pre-commit/mirrors-prettier
     rev: v2.7.1