Remove submodules section from dependabot.yml (#147)

.github/dependabot.yml

@@ -2,15 +2,6 @@
 
 version: 2
 updates:
-# Update the git submodules
-- package-ecosystem: "gitsubmodule"
-  directory: "/"
-  schedule:
-    interval: "daily"
-  labels:
-  - "dependencies"
-  - "automerge"
-
 # Update the Github Action  versions
 - package-ecosystem: "github-actions"
   directory: "/"