update constraint for pbr to new release 6.1.1

meta: version: 6.1.1
meta: team: oslo
meta: diff-start: -
meta: series: independent
meta: branch: master
meta: release-type: release
meta: pypi: yes
meta: first: no
meta: release:Author: Stephen Finucane <sfinucan@redhat.com>
meta: release:Commit: Jeremy Stanley <fungi@yuggoth.org>
meta: release:Change-Id: I26b10ec48ebd46e86516a88696b7e451aff0fd95
meta: release:Code-Review+1: Kacper Kulakowski <kkulakow@redhat.com>
meta: release:Code-Review+2: Elod Illes <elod.illes@est.tech>
meta: release:Code-Review+2: Dr. Jens Harbott <frickler@offenerstapel.de>
meta: release:Code-Review+1: Jeremy Stanley <fungi@yuggoth.org>
meta: release:Code-Review+1: Daniel Bengtsson <dbengt@redhat.com>
meta: release:Code-Review+1: Stephen Finucane <stephenfin@redhat.com>
meta: release:Workflow+1: Dr. Jens Harbott <frickler@offenerstapel.de>
Change-Id: Ib0470f269815c2fa533e0a92d2cd47d7a572892b

Author: OpenStack Proposal Bot

upper-constraints.txt

@@ -42,7 +42,7 @@ requests-aws===0.1.8
 alabaster===0.7.16;python_version=='3.9'
 alabaster===1.0.0;python_version>='3.10'
 multidict===6.1.0
-pbr===6.1.0
+pbr===6.1.1
 munch===4.0.0
 waiting===1.5.0
 attrs===24.3.0