update constraint for neutron-lib to new release 3.18.0

meta: version: 3.18.0
meta: team: neutron
meta: diff-start: -
meta: series: epoxy
meta: branch: master
meta: release-type: release
meta: pypi: yes
meta: first: no
meta: release:Author: Dr. Jens Harbott <harbott@osism.tech>
meta: release:Commit: Dr. Jens Harbott <harbott@osism.tech>
meta: release:Change-Id: I22a19107cd5e3b046bdc5eb7e13946be7be21dd1
meta: release:Workflow+1: Hervé Beraud <herveberaud.pro@gmail.com>
meta: release:Code-Review+1: Brian Haley <haleyb.dev@gmail.com>
meta: release:Code-Review+2: Dr. Jens Harbott <frickler@offenerstapel.de>
meta: release:Code-Review+2: Hervé Beraud <herveberaud.pro@gmail.com>
Change-Id: I3115226b0f5e31889610cfb7f9fa4fd8c4f81178

Author: OpenStack Proposal Bot

upper-constraints.txt

@@ -59,7 +59,7 @@ pycadf===4.0.0
 grpcio===1.69.0
 sniffio===1.3.1
 fixtures===4.2.2
-neutron-lib===3.17.0
+neutron-lib===3.18.0
 XStatic-FileSaver===1.3.2.0
 jaraco.functools===4.1.0
 jaraco.text===4.0.0