add monthly dependabot updates to GitHub Actions and scripts

.github/dependabot.yml

@@ -0,0 +1,28 @@
+# 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/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    groups:
+      "GitHub Actions updates":
+        patterns:
+          - "*"
+  - package-ecosystem: "pip"
+    directory: "/scripts"
+    schedule:
+      interval: "monthly"
+    allow:
+      - dependency-name: "*"
+        dependency-type: "all"
+    groups:
+      "Python dependencies updates":
+        dependency-type: "production"
+      "Python dependencies updates for tests":
+        dependency-type: "development"
+