Merge pull request aya-rs#21 from vadorovsky/dependabot

github: Add dependabot

Author: vadorovsky

.github/workflows/dependabot.yaml

@@ -0,0 +1,9 @@
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "weekly"