🔧 Add dependabot for python dependencies (#1227)

.github/dependabot.yml

@@ -1,6 +1,19 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
 version: 2
 updates:
-  - package-ecosystem: "github-actions"
-    directory: "/"
+  - package-ecosystem: github-actions
+    directory: /
+    commit-message:
+      prefix: 🔧
     schedule:
-      interval: "daily"
+      interval: monthly
+  - package-ecosystem: pip
+    directory: /
+    commit-message:
+      prefix: ⬆️
+    schedule:
+      interval: monthly