This seems to be a result of changes in the default cryptographic policy settings from version 8 to 9 of Alma Linux. We have updated it here;
# update-crypto-policies --set DEFAULT:SHA1
Setting system policy to DEFAULT:SHA1
Note: System-wide crypto policies are applied on application start-up.
It is recommended to restart the system for the change of policies
to fully take place.
Once we updated, we were then able to run the installer, and wp-toolkit is now installed;
# wp-toolkit --versions
Available versions:
6.2.2, 6.1.3, 6.0.5, 5.9.7, 5.8.7, 5.7.9, 5.6.11, 5.5.12, 5.4.13, 5.3.15, 5.2.18, 5.1