Python dependency: Bump pbr

Bumps the regression-python-minor-and-patch group with 1 update in the /web/regression directory: [pbr](https://docs.openstack.org/pbr/latest/).


Updates `pbr` from 7.0.3 to 7.1.3

---
updated-dependencies:
- dependency-name: pbr
  dependency-version: 7.1.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: regression-python-minor-and-patch
...

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

web/regression/requirements.txt

@@ -21,7 +21,7 @@
 # order—please add a comment in such cases and specify the
 # relevant packages.
 ###########################################################
-pbr==7.0.3
+pbr==7.1.3
 pycodestyle>=2.15.0
 selenium==4.44.0; python_version <= '3.9'
 selenium==4.51.0; python_version > '3.9'