ELY-2319 deleted the deprecated GSSCredentialSecurityFactory implementation. This fix was included in Elytron 2.4.0.CR1.

There's still a test in the WildFly full testsuite (SpnegoMechTestCase) that references the deprecated class.

We need to update the test to move to org.wildfly.security.mechanism.gssapi.GSSCredentialSecurityFactory instead.