fix: Update to use old timezone format

requirements.txt

@@ -3,4 +3,5 @@ gunicorn
 requests
 python-dotenv
 dnspython
-cryptography
+cryptography
+datetime

tools.py

@@ -101,7 +101,7 @@ def check_ssl(domain: str):
 
         expiry_date = cert_obj.not_valid_after_utc
         # Check if expiry date is past
-        if expiry_date < datetime.datetime.now(tz=datetime.UTC):
+        if expiry_date < datetime.datetime.now(datetime.timezone.utc):
             returns["cert"]["expired"] = True
             returns["cert"]["valid"] = False