Replace CompatHelper with dependabot (#75)

Author: blegat

.github/dependabot.yml

@@ -0,0 +1,11 @@
+version: 2
+updates:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "julia" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"