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

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

Author: pre-commit-ci[bot]

scripts/validate_solutions.py

@@ -67,6 +67,7 @@ def get_files_url() -> str:
         FileNotFoundError: if GITHUB_EVENT_PATH is missing.
     """
     import os, json
+
     with open(os.environ["GITHUB_EVENT_PATH"]) as f:
         event = json.load(f)
     return event["pull_request"]["url"] + "/files"