Upgrade to GitHub-native Dependabot

.github/dependabot.yml

@@ -0,0 +1,27 @@
+version: 2
+updates:
+- package-ecosystem: maven
+  directory: "/"
+  schedule:
+    interval: weekly
+    time: "16:00"
+    timezone: Etc/Universal
+  open-pull-requests-limit: 10
+  ignore:
+  - dependency-name: com.google.code.gson:gson
+    versions:
+    - "> 2.2.4"
+  - dependency-name: me.clip:placeholderapi
+    versions:
+    - "> 2.10.8, < 2.11"
+  - dependency-name: net.md-5:bungeecord-config
+    versions:
+    - "> 1.12-SNAPSHOT"
+  - dependency-name: de.xxschrandxx.bca:BungeeCordAuthenticator
+    versions:
+    - 0.0.3
+  - dependency-name: com.zaxxer:HikariCP
+    versions:
+    - 4.0.0
+    - 4.0.2
+    - 4.0.3