chore(ci): upgrade to GitHub-native Dependabot (#208)

* Upgrade to GitHub-native Dependabot

* chore: update dependabot.yml

copying from 
https://github.com/ipfs/rainbow/blob/main/.github/dependabot.yml

---------

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Marcin Rataj <[email protected]>

Author: dependabot-preview[bot]

.github/dependabot.yml

@@ -0,0 +1,11 @@
+---
+version: 2
+updates:
+  - package-ecosystem: gomod
+    directory: /
+    schedule:
+      interval: daily
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly