Upgrade to GitHub-native Dependabot (#103)

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

.github/dependabot.yml

@@ -0,0 +1,24 @@
+version: 2
+updates:
+- package-ecosystem: maven
+  directory: "/."
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10
+  ignore:
+  - dependency-name: com.twilio.sdk:twilio
+    versions:
+    - 8.10.0
+    - 8.6.1
+    - 8.7.0
+    - 8.8.0
+    - 8.9.0
+  - dependency-name: org.json:json
+    versions:
+    - "20201115"
+  - dependency-name: org.eclipse.jetty:jetty-maven-plugin
+    versions:
+    - 9.4.26.v20200117
+  - dependency-name: org.eclipse.jetty:jetty-server
+    versions:
+    - 9.4.26.v20200117