Add dependabot to update dependencies (#86)

.github/dependabot.yml

@@ -0,0 +1,30 @@
+#
+# Copyright 2020-Present Okta, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+version: 2
+updates:
+  # Dependencies for Maven
+  - package-ecosystem: 'maven'
+    directory: '/'
+    schedule:
+      interval: 'daily'
+    open-pull-requests-limit: 15
+
+  # Dependencies for GitHub Actions
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'daily'
+    open-pull-requests-limit: 10