Bump pbr from 5.11.1 to 6.0.0 (#11188)

Bumps [pbr](https://docs.openstack.org/pbr/latest/) from 5.11.1 to 6.0.0.

---
updated-dependencies:
- dependency-name: pbr
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -4,7 +4,7 @@ jinja2==3.1.4
 jmespath==1.0.1
 MarkupSafe==2.1.5
 netaddr==1.2.1
-pbr==5.11.1
+pbr==6.0.0
 ruamel.yaml==0.18.6
 ruamel.yaml.clib==0.2.8
 jsonschema==4.22.0