Security improvements to the Velocity Uberspector

This ticket documents an improvement to the Velocity Uberspector's security, locking down which classes can be accessed. This change is a defence-in-depth against potential Remote Code Execution (RCE) and Injection attacks.

The versions which do not have this improvement are before version 8.12.3.

Pre-improvement versions:

• version < 8.12.3

Improved versions:

• 8.12.3
• 8.13.0
• 8.14.0