Update drupal/jwt to 8.x-1.0-beta1

[kayakr]

Islandora composer.json pins drupal/jwt to 1.0.0-alpha6

[kayakr]

https://www.drupal.org/project/jwt/releases/8.x-1.0-beta2

[kayakr]

Reverted title change. I'll add a new issue for Update drupal/jwt to 8.x-1.0-beta2