Use https:// because GitHub no longer supports unauthenticated git://
https://github.com/nvie/gitflow/issues/6478
--- .gitmodules.orig	2024-01-22 03:01:50.000000000 -0600
+++ .gitmodules	2024-01-22 03:02:45.000000000 -0600
@@ -1,3 +1,3 @@
 [submodule "shFlags"]
 	path = shFlags
-	url = git://github.com/nvie/shFlags.git
+	url = https://github.com/nvie/shFlags.git