build(deps): bump pbr from 5.11.1 to 6.0.0

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
...

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

requirements.txt

@@ -68,7 +68,7 @@ multiformats==0.2.1
 multiformats-config==0.2.0.post4
 oauthlib==3.2.2
 packaging==23.2
-pbr==5.11.1
+pbr==6.0.0
 pkce==1.0.3
 praw==7.7.1
 prawcore==2.4.0