[sr-dev] [kamailio/kamailio] update libphonenum (#2635)

[Boden Garman]

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### Description
update libphonenum for the latest metadata please (currently v8.12.18)

### Additional Information
OS is CentOS 8 Stream

```# dnf list installed | grep phone
kamailio-phonenum.x86_64             5.4.3-0.el8.centos                      @kamailio
libphonenumber.x86_64                8.12.11-2.el8                           @kamailio
```

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