Add support for Exchange 2019 CU5

[karstennilsen]

Tested on our own server, works.

[discostur]

@karstennilsen could you maybe add support up to exchange 2019 CU12? ;)

https://github.com/Pro/exchange-catchall/issues/26

Thanks ;)

[karstennilsen]

In my experience the 2019 CU5 files also work for higher CU's. So you can use this commit.

[discostur]

@karstennilsen you are right - works perfect with 2019 CU12

Thanks ;)