shift to self-hosted frankfurter api (#14792)

diff --git a/erpnext/setup/utils.py b/erpnext/setup/utils.py
index 4f62815..f318c04 100644
--- a/erpnext/setup/utils.py
+++ b/erpnext/setup/utils.py
@@ -95,7 +95,7 @@
 
 		if not value:
 			import requests
-			api_url = "https://exchangeratesapi.io/api/{0}".format(transaction_date)
+			api_url = "https://frankfurter.erpnext.org/{0}".format(transaction_date)
 			response = requests.get(api_url, params={
 				"base": from_currency,
 				"symbols": to_currency