Merge pull request #12774: [BEAM-10567] Cherrypick #12765: Add LICENSE for pbr

[BEAM-10567] Cherrypick #12765: Add LICENSE for pbr

Author: youngoli

sdks/python/container/license_scripts/dep_urls_py.yaml

@@ -95,6 +95,8 @@ pip_dependencies:
     license: "https://raw.githubusercontent.com/protocolbuffers/protobuf/master/LICENSE"
   protorpc:
     license: "https://raw.githubusercontent.com/google/protorpc/master/LICENSE"
+  pbr:
+    license: "https://opendev.org/openstack/pbr/raw/branch/master/LICENSE"
   pyarrow:
     license: "https://raw.githubusercontent.com/apache/arrow/master/LICENSE.txt"
     notice: "https://raw.githubusercontent.com/apache/arrow/master/NOTICE.txt"