Remove python-dateutil from requirements

This lib was only used by the "podman1" module in Tobiko and that was
removed with [1].
Additionally python-dateutil was pinned to the 2.8.2 version and that
was causing issues with building rpm on Centos 10 stream.

[1] https://review.opendev.org/c/x/tobiko/+/952377

Closes: #OSPCIX-987

Change-Id: I682ebdcb91c36f11749233697e51fe462766ad25
Signed-off-by: Slawek Kaplonski <skaplons@redhat.com>

lower-constraints.txt

@@ -19,7 +19,6 @@ psutil==5.8.0
 pytest===7.2.0
 pytest-html==4.1.1
 pytest-xdist==3.5.0
-python-dateutil==2.8.0
 python-designateclient==4.4.0
 python-glanceclient==3.2.2
 python-heatclient==2.3.0

requirements.txt

@@ -16,7 +16,6 @@ packaging>=20.4                 # Apache-2.0
 paramiko>=2.9.2                 # LGPLv2.1
 pbr>=5.5.1                      # Apache-2.0
 psutil>=5.8.0                   # BSD
-python-dateutil>=2.8.0          # Apache-2.0
 python-designateclient>=4.4.0   # Apache-2.0
 python-glanceclient>=3.2.2      # Apache-2.0
 python-heatclient>=2.3.0        # Apache-2.0

upper-constraints.txt

@@ -346,7 +346,6 @@ python-cloudkittyclient===4.5.0
 python-consul===1.1.0
 python-cyborgclient===1.7.0
 python-daemon===2.3.0
-python-dateutil===2.8.2
 python-designateclient===4.5.1
 python-freezerclient===4.4.0
 python-glanceclient===3.6.0