requirements: Fix duplicate "packaging" entry

We merged a second entry for "packaging" to
requirements.txt, now the requirements-check
gate job is failing with:

ERROR: Package 'packaging' requirement does not match number of lines (1) in openstack/requirements

Change-Id: I3b5c62aa356f6bcffe2d927c18c3b8c24c68ad54
Signed-off-by: Eric Harney <eharney@redhat.com>
(cherry picked from commit cee90b0)

Author: eharney

requirements.txt

@@ -28,7 +28,7 @@ oslo.upgradecheck>=1.1.1 # Apache-2.0
 oslo.utils>=6.0.0 # Apache-2.0
 oslo.versionedobjects>=2.4.0 # Apache-2.0
 osprofiler>=3.4.0 # Apache-2.0
-packaging>=20.4
+packaging>=20.9 # Apache-2.0
 paramiko>=2.7.2 # LGPLv2.1+
 Paste>=3.4.3 # MIT
 PasteDeploy>=2.1.0 # MIT
@@ -60,4 +60,3 @@ boto3>=1.18.49 # Apache-2.0
 distro>=1.8.0 # Apache-2.0
 tzdata>=2022.4 # MIT
 cachetools>=4.2.1 # MIT
-packaging>=20.9 # Apache-2.0