Migrate Post-7.5.x assertions

[Philzen]

This project's build is currently targeting java 8, which is why the gradle build will complain when using TestNG 7.6 and later (which require 11+). Need to clarify if it is OK to release with this warning while retaining general build compatibilty with Java 8.

Should this go forward so that latest TestNG dependency can be included, migrations for the following TestNg Assert.* methods need to be added:

• assertListContains[java.util.List arg0, java.util.function.Predicate arg1, java.lang.String arg2]
• assertListContainsObject[java.util.List arg0, T arg1, java.lang.String arg2]
• assertListNotContains[java.util.List arg0, java.util.function.Predicate arg1, java.lang.String arg2]
• assertListNotContainsObject[java.util.List arg0, T arg1, java.lang.String arg2]
• assertThrows[java.lang.String arg0, java.lang.Class arg1, org.testng.- [ ] assert$ThrowingRunnable arg2]
• expectThrows[java.lang.String arg0, java.lang.Class arg1, org.testng.- [ ] assert$ThrowingRunnable arg2]