Upgrade jwt 1.5.4 (1.5.3 was yanked)
Upgrade jwt 1.5.4 (1.5.3 was yanked)

remi/ruby-docs-samples,GoogleCloudPlatform/ruby-docs-samples,GoogleCloudPlatform/ruby-docs-samples,GoogleCloudPlatform/ruby-docs-samples,remi/ruby-docs-samples,GoogleCloudPlatform/ruby-docs-samples,remi/ruby-docs-samples