feat(dependabot): update config to version 2 (#19)

https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#about-the-dependabotyml-file

.dependabot/config.yml

@@ -1,10 +0,0 @@
----
-version: 1
-update_configs:
-  - package_manager: "docker"
-    directory: "/"
-    update_schedule: "weekly"
-    automerged_updates:
-      - match:
-          dependency_type: "all"
-          update_type: "all"

.github/dependabot.yml

@@ -0,0 +1,17 @@
+---
+# See https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates
+version: 2
+updates:
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: "chore(docker): "
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: "chore(action): "