build(deps): Bump ansible in /zstackbuild/pypi_source

Bumps [ansible](https://github.com/ansible/ansible) from 1.8.2 to 4.2.0.
- [Release notes](https://github.com/ansible/ansible/releases)
- [Commits](https://github.com/ansible/ansible/commits)

---
updated-dependencies:
- dependency-name: ansible
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

zstackbuild/pypi_source/requirements.txt

@@ -1,5 +1,5 @@
 amqp==1.4.9
-ansible==1.8.2
+ansible==4.2.0
 anyjson==0.3.3
 argparse==1.3.0
 CherryPy==3.2.4