Arch Linux

Description:
Invalid signature error during the upgrade of the package.

On the package's page https://archlinux.org/packages/core/x86_64/libinih/, there's `Signed By: Unknown (0x81506130)`, as shown also on the attached screenshot.

Additional info:
* package version(s) Upgrade from 53-2 to 55-2
* config and/or log files etc.
```
$ sudo pacman -Syu
...
(190/190) checking keys in keyring [##############################################################] 100%
downloading required keys...
:: Import PGP key 0F65C7D881506130, "Maxime Gauduin <alucryd@archlinux.org>"? [Y/n] y
(190/190) checking package integrity [##############################################################] 100%
error: libinih: key "95220BE99CE6FF778AE0DC670F65C7D881506130" is unknown
:: Import PGP key 95220BE99CE6FF778AE0DC670F65C7D881506130? [Y/n] y
:: File /var/cache/pacman/pkg/libinih-55-2-x86_64.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] y
error: failed to commit transaction (invalid or corrupted package)
Errors occurred, no packages were upgraded.
```
* link to upstream bug report, if any -