Special rule for vercel.app

This issue are taking care of one of our time biggest phishing network

See:

- https://kb.mypdns.org/issue/MTX-1402
- mypdns/matrix#1400

By adding the HTTP code 451, we should be able to remove any outdated records

Closes #407

Signed-off-by: spirillen <44526987+spirillen@users.noreply.github.com>

Author: spirillen

PyFunceble/checker/availability/extras/rules.py

@@ -98,6 +98,7 @@ def __init__(self, status: Optional[AvailabilityCheckerStatus] = None) -> None:
             r"\.sz.id$": [(self.switch_to_down_if_status_code, 302)],
             r"\.translate\.goog$": [(self.switch_to_down_if_status_code, 403)],
             r"\.tumblr\.com$": [(self.switch_to_down_if_status_code, 404)],
+            r"\.vercel\.app$": [(self.switch_to_down_if_status_code, 451)],
             r"\.web\.app$": [(self.switch_to_down_if_status_code, 404)],
             r"\.wix\.com$": [(self.switch_to_down_if_status_code, 404)],
             r"^s3\.ap-south-1\.amazonaws\.com$": [