Upgrade to GitHub-native Dependabot

.github/dependabot.yml

@@ -0,0 +1,36 @@
+version: 2
+updates:
+- package-ecosystem: bundler
+  directory: "/"
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10
+  ignore:
+  - dependency-name: bootsnap
+    versions:
+    - 1.7.0
+    - 1.7.1
+    - 1.7.2
+    - 1.7.3
+  - dependency-name: skylight
+    versions:
+    - 4.3.2
+    - 5.0.0
+  - dependency-name: webmock
+    versions:
+    - 3.11.2
+    - 3.11.3
+    - 3.12.0
+    - 3.12.1
+  - dependency-name: rails
+    versions:
+    - 6.1.1
+    - 6.1.2
+    - 6.1.2.1
+    - 6.1.3
+  - dependency-name: brakeman
+    versions:
+    - 5.0.0
+  - dependency-name: webdrivers
+    versions:
+    - 4.5.0