Add firebase/php-jwt 7 to composer

[WoBBeLnl]

Can firebase/php-jwt 7.x be added? Currently the messagebird php-rest-api is preventing me from upgrading.

"firebase/php-jwt": "^5.5.1|^6.2"

[bobvandevijver]

Note that this has become a security concern: GHSA-2x45-7fc3-mxwq

[frederikbosch]

Yes, this needs a fix asap. I’ll try to PR today, but if someone beats me to it, please do.