Bug#1005272: libxt6: out-of-date copyright file

[Mechtilde Stehmann]

user debian-rele...@lists.debian.org 

usertags -1 + bsp-2022-11-nl-tilburg
thank you

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Mechtilde Stehmann
## Debian Developer
## PGP encryption welcome
## F0E3 7F3D C87A 4998 2899  39E7 F287 7BBA 141A AD7F