fix: scp-like url syntax

indeed in scp like syntax no : are allowed in url
here now we don't use scp like url anymore.
To use scp like syntax we need to remove ssh:// prefix and just keep git:: one

https://developer.hashicorp.com/terraform/language/modules/sources#scp-like-address-syntax

README.md

@@ -6,7 +6,7 @@ usage example:
 
 ```hcl
 module "image-uploader-mock" {
-  source = "git::ssh://gitolite@antoine-roux.tk:virtualization/terraform-library.git?depth=1&ref=main"
+  source = "git::ssh://gitolite@antoine-roux.tk/virtualization/terraform-library.git?depth=1&ref=main"
   application_name = "wiremock"
   namespace        = local.default_namespace
   image            = {