Glance fails to build with oslo.log 4.4.0 for Debian platform

Glance RC1 for Xena fails to build with oslo.log 4.4.0 for Debian platform so we need to bump the oslo.log version in requirements.txt

Failures during discovery
=========================
--- import errors ---
Failed to import test module: glance.tests.unit.api.middleware.test_cache_manage
Traceback (most recent call last):
  File "/usr/lib/python3.9/unittest/loader.py", line 436, in _find_test_path
    module = self._get_module_from_name(name)
  File "/usr/lib/python3.9/unittest/loader.py", line 377, in _get_module_from_name
    __import__(name)
  File "/<<PKGBUILDDIR>>/glance/tests/unit/api/middleware/test_cache_manage.py", line 13, in <module>
    from glance.api.middleware import cache_manage
  File "/<<PKGBUILDDIR>>/glance/api/middleware/cache_manage.py", line 23, in <module>
    from glance.api.v2 import cached_images
  File "/<<PKGBUILDDIR>>/glance/api/v2/cached_images.py", line 23, in <module>
    from glance.api import policy
  File "/<<PKGBUILDDIR>>/glance/api/policy.py", line 30, in <module>
    from glance import policies
  File "/<<PKGBUILDDIR>>/glance/policies/__init__.py", line 17, in <module>
    from glance.policies import metadef
  File "/<<PKGBUILDDIR>>/glance/policies/metadef.py", line 39, in <module>
    deprecated_since=versionutils.deprecated.XENA
AttributeError: type object 'deprecated' has no attribute 'XENA'

versionutils module of oslo.log included Xena release from version 4.5.0