Create dependabot.yml (#151)

Motivation:
Dependabot handles dependency updates and we should use it for that.

Modification:
Added `dependabot.yml` to enable Dependabot.

Result:
Dependabot enabled

.github/dependabot.yml

@@ -0,0 +1,17 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "maven"
+    directories:
+      - "/"
+    schedule:
+      interval: "daily"
+  - package-ecosystem: "github-actions"
+    directories:
+      - "/"
+    schedule:
+      interval: "daily"