Wait a week before dropping support for end of life GHES versions

.github/workflows/update-supported-enterprise-server-versions/update.py

@@ -35,7 +35,9 @@ def main():
 
 		if oldest_supported_release is None or release_version < oldest_supported_release:
 			end_of_life_date = datetime.date.fromisoformat(release_data["end"])
-			if end_of_life_date > datetime.date.today():
+			# The GHES version is not actually end of life until the end of the day specified by
+			# `end_of_life_date`. Wait an extra week to be safe.
+			if end_of_life_date > datetime.date.today() + datetime.timedelta(weeks=1):
 				oldest_supported_release = release_version
 
 	api_compatibility_data = {