Since I'm not sure in which level of details you need, here are some more:
- You can find a package in a published OBS project under
https://download.opensuse.org/repositories/...
in this case, it's
https://download.opensuse.org/repositories/Kernel:/HEAD/standard/noarch/
- Download kernel-firmware-iwlwifi*.rpm from the above URL.
As of writing this, it's
https://download.opensuse.org/repositories/Kernel:/HEAD/standard/noarch/kernel-firmware-iwlwifi-20210609-363.1.noarch.rpm
- Install this package with either rpm or zypper.
A caveat is that there is a dependency in kernel-firmwre-all package, so
maybe it's simpler to use rpm with --nodeps option.
% rpm -Uvh --nodeps --force kernel-firmware-iwlwifi*.rpm
- Reboot and retest.