Update Dependabot configuration

.github/dependabot.yml

@@ -1,5 +1,13 @@
 version: 2
 
+registries:
+
+  github-privacyguides:
+    type: git
+    url: https://github.com
+    username: x-access-token
+    password: ${{secrets.REPO_PAT}}
+
 updates:
 
   # Maintain dependencies for GitHub Actions
@@ -13,3 +21,28 @@ updates:
       - "jonaharagon"
     labels:
       - "fix:github_actions"
+  
+  # Maintain submodules
+  - package-ecosystem: "gitsubmodule"
+    directory: "/"
+    registries:
+      - github-privacyguides
+    schedule:
+      interval: "daily"
+    labels:
+      - "fix:submodules"
+
+  # Maintain dependencies for pipenv
+  - package-ecosystem: "pip"
+    directory: "/"
+    insecure-external-code-execution: allow
+    registries:
+      - github-privacyguides
+    schedule:
+      interval: "daily"
+    assignees:
+      - "jonaharagon"
+    reviewers:
+      - "jonaharagon"
+    labels:
+      - "fix:python"