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signature from "Alexey Pavlov (Alexpux) <alexpux@gmail.com>" is invalid

See original GitHub issue

I’m getting many errors about invalid signatures in my CI:

2020-12-30T07:53:10.1381061Z error: mingw-w64-x86_64-icu: signature from "Alexey Pavlov (Alexpux) <alexpux@gmail.com>" is invalid
2020-12-30T07:53:10.1382702Z :: File /var/cache/pacman/pkg/mingw-w64-x86_64-icu-68.2-1-any.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)).
2020-12-30T07:53:10.1395297Z Do you want to delete it? [Y/n] error: mingw-w64-x86_64-boost: signature from "Alexey Pavlov (Alexpux) <alexpux@gmail.com>" is invalid
2020-12-30T07:53:10.1396779Z 
2020-12-30T07:53:10.1398296Z :: File /var/cache/pacman/pkg/mingw-w64-x86_64-boost-1.75.0-1-any.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)).
2020-12-30T07:53:10.1416780Z Do you want to delete it? [Y/n] error: mingw-w64-x86_64-harfbuzz: signature from "Alexey Pavlov (Alexpux) <alexpux@gmail.com>" is invalid
2020-12-30T07:53:10.1418414Z 
2020-12-30T07:53:10.1419562Z :: File /var/cache/pacman/pkg/mingw-w64-x86_64-harfbuzz-2.7.3-1-any.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)).
2020-12-30T07:53:10.1420770Z Do you want to delete it? [Y/n] error: failed to commit transaction (invalid or corrupted package)
2020-12-30T07:53:10.1731366Z 
2020-12-30T07:53:10.1734005Z Errors occurred, no packages were upgraded.
2020-12-30T07:53:10.1797630Z ##[error]The process 'C:\windows\system32\cmd.exe' failed with exit code 1

Is it a problem only in this repo or in all of msys2 or all of pacman?