Bump pbr from 5.1.3 to 5.2.0
Bump pbr from 5.1.3 to 5.2.0

Bumps [pbr](https://docs.openstack.org/pbr/latest/) from 5.1.3 to 5.2.0.

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
dpursehouse/pygerrit2