THRIFT-5701: Add dependabot (#2784)

* THRIFT-5701: Add dependabot

To keep up to date with the latest dependencies

* Update dependabot.yml

* Change to monthly

* Add `/lib/kotlin`
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..b53f01b
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,33 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: monthly
+  - package-ecosystem: "gradle"
+    directory: "/lib/java"
+    schedule:
+      interval: monthly
+  - package-ecosystem: "gradle"
+    directory: "/lib/kotlin"
+    schedule:
+      interval: monthly