Fix tests on master

The security framework has been removed from the master branch,
remove the calls to it here and make the testcases pass again.

Resolves:
Object: Exception error: did not understand #isUntrusted
MessageNotUnderstood(Exception)>>signal (ExcHandling.st:254)
Exception class(Object)>>doesNotUnderstand: #isUntrusted (SysExcept.st:1403)
Metaclass>>newMeta:environment:subclassOf:instanceVariableArray:shape:classPool:poolDictionaries:category: (SystemEvents.star#VFS.ZipFile/Installation/Installer.st:56)
CompiledMethod>>valueWithReceiver:withArguments: (CompildMeth.st:408)
optimized [] in UndefinedObject>>executeStatements (SystemEvents.star#VFS.ZipFile/Installation/Installer.st:89)
BlockWrapper>>valueWithReceiver:withArguments: (SystemEvents.star#VFS.ZipFile/Wrapper/BlockWrapper.st:55)