build: add dependabot

Author: mbdevpl

.github/dependabot.yml

@@ -0,0 +1,16 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: monthly
+  - package-ecosystem: pip
+    directory: /
+    schedule:
+      interval: monthly
+    versioning-strategy: increase-if-necessary
+    ignore:
+      - dependency-name: >-
+          *
+        update-types:
+          - version-update:semver-patch