Upgrade to GitHub-native Dependabot (#28)

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

Author: dependabot-preview[bot]

.github/dependabot.yml

@@ -0,0 +1,19 @@
+version: 2
+updates:
+- package-ecosystem: gradle
+  directory: "/"
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10
+  ignore:
+  - dependency-name: org.springframework.boot:spring-boot-gradle-plugin
+    versions:
+    - 2.4.2
+    - 2.4.3
+    - 2.4.4
+  - dependency-name: org.webjars:bootstrap
+    versions:
+    - 4.6.0
+  - dependency-name: org.webjars:jquery
+    versions:
+    - 3.5.1