Bump httplib2 from 0.11.3 to 0.19.0 in /demo/python-rest-client (#27)
Bump httplib2 from 0.11.3 to 0.19.0 in /demo/python-rest-client (#27)

Bumps [httplib2](https://github.com/httplib2/httplib2) from 0.11.3 to 0.19.0.
- [Release notes](https://github.com/httplib2/httplib2/releases)
- [Changelog](https://github.com/httplib2/httplib2/blob/master/CHANGELOG)
- [Commits](https://github.com/httplib2/httplib2/compare/v0.11.3...v0.19.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
GoogleCloudPlatform/kafka-pubsub-emulator,GoogleCloudPlatform/kafka-pubsub-emulator,GoogleCloudPlatform/kafka-pubsub-emulator