Bump pbr from 5.1.0 to 5.1.1 (#5012)
Bump pbr from 5.1.0 to 5.1.1 (#5012)

Bumps [pbr](https://docs.openstack.org/pbr/latest/) from 5.1.0 to 5.1.1.

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
dstufft/warehouse,pypa/warehouse,dstufft/warehouse,pypa/warehouse,dstufft/warehouse,pypa/warehouse,dstufft/warehouse,pypa/warehouse