Changelog v23.09.6

ad065f1a Set release date for 23.09.6.
79451641 ovs: Bump submodule to OVS v3.2.3.
883c3679 ipam: Do not report error for static assigned IPs.
44fe79b1 ovn-trace: Fix copy-paste error for tracing put_nd_ra_opts().
d762c8fc controller: Properly handle localnet flows in I+P.
b267acd6 controller: Accept unicast dhcp-discover in pinctrl_handle_put_dhcp_opts().
13b2efae ovn-ic: Fix potential segmentation violation.
d1f55ee8 controller: Container lport install flows in MAIN chassis only.
d7738bdc ci: Pin scapy version.
e2fa4a52 northd: Respect –ecmp-symmetric-reply for single routes.
5c78002d controller: Avoid quadratic complexity for multi-chassis ports.
8e97c067 northd: Fix NULL pointer deref within build_bfd_table.
db7c577e physical: Prevent wrong FDB to be learned with multichassis port.
fa8e36f5 ovn-controller: Fix potential assert when exiting.
ec2ade13 Documentation: Add inclusive-language documentation.
caa6dc96 tests: Skip “IPv6 switching - megaflow check” if scapy is not installed.
6b6bfd53 Reply only for the multicast ND solicitations.
3b523c81 Prepare for 23.09.6.