Missing PGP signature forbids update

Hello, I'm trying to update my system and I get the following:

:: File /var/cache/pacman/pkg/dxvk-mingw-git-1.7.3.r18.g5852e318-1-x86_64.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] 

Can someone please tell me how to add the proper key?

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