feat: add depandabot template

• Testing

r2_metadata/depandabot.r2.yml

+files:
+    template: ../templates/python/dependency_management/depandabot/depandabot.yml
+    documentation: ../templates/python/dependency_management/depandabot/README.md
+    changelog: ../templates/python/dependency_management/depandabot/CHANGELOG.md
+data:
+    description: "Run pip-compile to generate a requirements.txt and create a merge request on your repository with the updated requirements.txt"
+    icon: ⚫
+    public: true
+    labels:
+        - Utilities
+        - Dependency management
+        - Gitlab
+        - Python
+    license: MIT
+    deprecated: false