Update vehicles.lua

[warlikeprince]

Describe Pull request Missing vehicle "Impaler SZ" from latest DLC "The Chop Shop" added in core

If your PR is to fix an issue mention that issue here

Questions (please complete the following information):

• Have you personally loaded this code into an updated qbcore project and checked all it's functionality? [yes]
• Does your code fit the style guidelines? [yes]
• Does your PR fit the contribution guidelines? [yes]