Upgrade to GitHub-native Dependabot (#1874)

* Upgrade to GitHub-native Dependabot

* Update dependabot.yml

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Risto Lahtela <24460436+AuroraLS3@users.noreply.github.com>

.github/dependabot.yml

@@ -0,0 +1,17 @@
+version: 2
+updates:
+- package-ecosystem: gradle
+  directory: "/Plan"
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 99
+  ignore:
+  - dependency-name: com.djrapitops:Extension-ProtocolSupport
+    versions:
+    - ">= 4.a, < 5"
+  - dependency-name: com.djrapitops:Extension-Tebex
+    versions:
+    - "> R0.6"
+  - dependency-name: com.h2database:h2
+    versions:
+    - "> 1.4.199"