chore: migrate to owl bot

.github/.OwlBot.lock.yaml

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+docker:
+  digest: sha256:f556e6e7be625deb1b2429fe608df27be57185c3e6b7d39ee0059f1609f17530
+  image: gcr.io/repo-automation-bots/owlbot-nodejs:latest  
+

.github/.OwlBot.yaml

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+# Copyright 2021 Google LLC
+#
+# 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.
+docker:
+  image: gcr.io/repo-automation-bots/owlbot-nodejs:latest
+
+
+begin-after-commit-hash: efb563da184f479fabf98da24f969494944d059b
+

owlbot.py

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+# Copyright 2021 Google LLC
+#
+# 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
+#
+#     https://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.
+
+import synthtool.languages.node as node
+
+node.owlbot_main(templates_excludes=[
+  '.mocharc.js'
+])