fix: switch to datetime.now() instead of our get_datetime()

`get_datetime()` will query the DB to get the system timezone, not something we currently have.

Signed-off-by: Akhil Narang <me@akhilnarang.dev>

frappe/installer.py

@@ -71,13 +71,12 @@ def _new_site(
 
 	if not db_name:
 		import hashlib
-
-		from frappe.utils.data import get_datetime
+		from datetime import datetime
 
 		db_name = (
 			"_"
 			+ hashlib.sha1(
-				(os.path.realpath(frappe.get_site_path()) + get_datetime().isoformat()).encode(),
+				(os.path.realpath(frappe.get_site_path()) + datetime.now().isoformat()).encode(),
 				usedforsecurity=False,
 			).hexdigest()[:16]
 		)