Python3.11 unit test failures

[Vishal Manchanda]

There are 7 VolumeBackup test failures with python3.11:

FAILED openstack_dashboard/dashboards/project/backups/tests.py::VolumeBackupsViewTests::test_create_backup_available - re.error: global flags not at the start of the expression at position 1
FAILED openstack_dashboard/dashboards/project/backups/tests.py::VolumeBackupsViewTests::test_create_backup_available_incremental - re.error: global flags not at the start of the expression at position 1
FAILED openstack_dashboard/dashboards/project/backups/tests.py::VolumeBackupsViewTests::test_create_backup_from_snapshot_table - re.error: global flags not at the start of the expression at position 1
FAILED openstack_dashboard/dashboards/project/backups/tests.py::VolumeBackupsViewTests::test_create_backup_from_snapshot_volume_table - re.error: global flags not at the start of the expression at position 1
FAILED openstack_dashboard/dashboards/project/backups/tests.py::VolumeBackupsViewTests::test_create_backup_in_use - re.error: global flags not at the start of the expression at position 1
FAILED openstack_dashboard/dashboards/project/backups/tests.py::VolumeBackupsViewTests::test_create_backup_in_use_incremental - re.error: global flags not at the start of the expression at position 1
FAILED openstack_dashboard/dashboards/project/backups/tests.py::VolumeBackupsViewTests::test_create_backup_in_use_incremental_set_false - re.error: global flags not at the start of the expression at position 1

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/horizon/+/895945

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/horizon/+/895945
Committed: https://opendev.org/openstack/horizon/commit/1457628e0ea33065f3384d186fbea821d46910f6
Submitter: "Zuul (22348)"
Branch: master

commit 1457628e0ea33065f3384d186fbea821d46910f6
Author: manchandavishal <email address hidden>
Date: Wed Sep 20 21:15:13 2023 +0530

    Fix Python3.11 unit test failures

    In Python 3.11, regex have undergone changes in
    how they handle Unicode characters. In Python3.11,
    global flags must be placed right at the start of a
    regular expression. The following regex:

            validators.RegexValidator(r'^(?u)[^/]+$')
    must become:
            validators.RegexValidator(r'(?u)^[^/]+$')

    Closes-Bug: #2036378
    Change-Id: I3884ae5b3a32e33077cf3efeac649ac0c615fdda

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/horizon 23.4.0 release.