build: Migrate to dependabot v2 (#99)

.dependabot/config.yml

@@ -1,35 +0,0 @@
-# Documentation in https://dependabot.com/docs/config-file/
-version: 1
-update_configs:
-  - package_manager: "java:maven"
-    directory: "/"
-    update_schedule: "daily"
-    allowed_updates:
-      - match:
-          update_type: "security"
-    default_labels:
-      - "area/dependencies"
-  - package_manager: "docker"
-    directory: "/dockerfiles/che"
-    update_schedule: "daily"
-    allowed_updates:
-      - match:
-          update_type: "security"
-    default_labels:
-      - "area/dependencies"
-  - package_manager: "docker"
-    directory: "/dockerfiles/keycloak"
-    update_schedule: "daily"
-    allowed_updates:
-      - match:
-          update_type: "security"
-    default_labels:
-      - "area/dependencies"
-  - package_manager: "docker"
-    directory: "/dockerfiles/postgres"
-    update_schedule: "daily"
-    allowed_updates:
-      - match:
-          update_type: "security"
-    default_labels:
-      - "area/dependencies"

.github/dependabot.yml

@@ -0,0 +1,8 @@
+version: 2
+updates:
+  - package-ecosystem: maven
+    directory: "/"
+    schedule:
+      interval: daily
+      time: "03:00"
+    open-pull-requests-limit: 15