Use a safer key to deploy contract on testnet

# Description
current contracts deployed on testnet were using a public key for test, see here https://github.com/search?q=ckt1qzda0cr08m85hc8jlnfp3zer7xulejywt49kt2rr0vthywaa50xwsq28phxutezqvjgfv5q38gn5kwek4m9km3cmajeqs&ref=opensearch&type=code

for safety concerns, we are supposed to change this key in our next and further deployment process.