LwM2M client utils conn mon object incompatible with 1.3 version of object

When using NCS v2.6.0 I have noticed (while troubleshooting other non NCS related problem) that when using LwM2M client utils for location assistance service that support for LAC resource inside connectivity monitoring object is define guarded by Kconfig option "CONFIG_LWM2M_CONNMON_OBJECT_VERSION_1_2"

From NCS v2.5.0 there also exists 1.3 version of said object that gets chosen by using Kconfig option "CONFIG_LWM2M_CONNMON_OBJECT_VERSION_1_3". nrf/subsys/net/lib/lwm2m_client_utils/lwm2m/lwm2m_connmon.c should be updated to also recognize v1.3 option when registering LAC resource.

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