chore: Bump JWT to `2.7.0`

[alex-damian-negru]

Fixes #633

Closes #633 by bumping the max jwt dependency version to 2.7.

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[alex-damian-negru]

Ah, it seems like this kinda duplicates https://github.com/twilio/twilio-ruby/pull/630 .

My bad ¯_(ツ)_/¯