Add prototype pollution gadgets in server-side template engines found by UoPF

[jackfromeast]

Hi @yuske,

I hope you're doing well!

This repository is an excellent place to gather all the gadgets discovered by UoPF. Thank you so much for the fantastic work!

Please feel free to point out any areas that need updating, and I'll be happy to align everything with the other gadgets accordingly.

Best Regards, Zhengyu