chore(python): add license header to auto-label.yaml

Source-Link: googleapis/synthtool@eb78c98
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:8a5d3f6a2e43ed8293f34e06a2f56931d1e88a2694c3bb11b15df4eb256ad163

.github/.OwlBot.lock.yaml

@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:1894490910e891a385484514b22eb5133578897eb5b3c380e6d8ad475c6647cd
-# created: 2022-04-01T15:48:07.524222836Z
+  digest: sha256:8a5d3f6a2e43ed8293f34e06a2f56931d1e88a2694c3bb11b15df4eb256ad163
+# created: 2022-04-06T10:30:21.687684602Z

.github/auto-label.yaml

@@ -1,2 +1,15 @@
+# Copyright 2022 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.
 requestsize:
   enabled: true