Code QA suggestion for JarvisV4MintBridge.sol

[htadashi]

These variables could be replaced by a constant variable in the contract:
https://github.com/defibasket/defibasket-contracts/blob/1e44ba96400a0a0f22279a975473e3e277507635/contracts/bridges/Jarvis/JarvisV4MintBridge.sol#L48

https://github.com/defibasket/defibasket-contracts/blob/1e44ba96400a0a0f22279a975473e3e277507635/contracts/bridges/Jarvis/JarvisV4MintBridge.sol#L90

Also, it would be nice to use _ to separate group of digits :)