fix(ci): don't double-wrap fix hints in code blocks

The fix_hint field already contains markdown code blocks, so
write_github_summary shouldn't wrap it in another code block.

Author: danceratopz

scripts/fast_checks.py

@@ -52,9 +52,8 @@ def write_github_summary(check: Check, check_key: str, output: str) -> None:
         f.write(output)
         f.write("\n```\n\n")
         f.write("### How to fix\n\n")
-        f.write("```bash\n")
         f.write(check.fix_hint)
-        f.write("\n```\n\n")
+        f.write("\n\n")
         f.write("### How to verify\n\n")
         f.write("Run the tool directly:\n\n")
         f.write("```bash\n")