it's in the subject. Someone has forgotten to sign the package, my package manager is (rightfully) refusing to update Skype:
Package skypeforlinux_18.104.22.168-1.x86_64.rpm is not signed
Error: GPG check FAILED
See "Signature: (none)" below.
it should be (like is the case with the older version https://repo.skype.com/rpm/stable/skypeforlinux_22.214.171.124-1.x86_64.rpm):
Signature : RSA/SHA1, Mon 15 Jun 2020 10:41:04 CEST, Key ID 1f3045a5df7587c3
$ wget https://repo.skype.com/rpm/stable/skypeforlinux_126.96.36.199-1.x86_64.rpm
$ rpm -qpi skypeforlinux_188.8.131.52-1.x86_64.rpm
Name : skypeforlinux
Version : 184.108.40.206
Release : 1
Install Date: (not installed)
Group : Applications/Internet
Size : 297233850
License : Skype End User License Agreement
Signature : (none)
Source RPM : skypeforlinux-220.127.116.11-1.src.rpm
Build Date : Tue 07 Jul 2020 03:43:40 CEST
Build Host : neu-vn-stretch-210
Vendor : Skype Software Sarl
URL : https://www.skype.com/
Summary : Skype keeps the world talking, for free.
Skype keeps you together. Call, message and share with others.
* It's free to download and join.
* Call, instant message and send photos and documents to anyone else on Skype.
* Easily text message anywhere in the world.
* Get your friends together on a group call.
And that's just the start...