Add Dependabot config (#4)

Author: danbarr

.github/dependabot.yml

@@ -0,0 +1,15 @@
+version: 2
+updates:
+  # Enable version updates for Go modules
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+
+  # Enable version updates for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10