ci(dependabot config): initial version (#15)

Configures Dependabot version updates, which enables Dependabot to open
pull requests automatically to keep dependencies up-to-date when new
versions are available.

Author: parkerbxyz

.github/dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"