release: Add a setting to exclude dependabot from generate-notes content (#76)

`generate-notes` option is used to generate release notes, so configure
it the same as enactic/openarm_description#35.

.github/release.yml

@@ -0,0 +1,18 @@
+# Copyright 2025 Enactic, 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.
+
+changelog:
+  exclude:
+    authors:
+      - dependabot[bot]