Update grape requirement from ~> 1.7.0 to ~> 2.1.0 #720

Job	Run time
lint	56s
ruby 3.3, default	3m 51s
ruby 3.2, elasticsearch, elasticsearch	0s
ruby 2.7, graphql-1.9.x	0s
ruby 2.7, mongoid-6.x, mongoid-6	0s
ruby 2.7, rails-5.2.x	0s
ruby 2.7, sidekiq-5.x	0s
ruby 3.2, graphql-2.0.17	0s
ruby 3.2, rails-6.1.x, mongo	0s
ruby 3.2, rails-6.0.x	0s
ruby 3.2, rails-6.1.x	0s
[allowed to fail] ruby 3.3, rails-edge	0s
ruby 3.3, sinatra-2.x	0s
[allowed to fail] ruby 3.3, sinatra-edge	0s
ruby 2.7, grape-1.2.x	0s
ruby 2.7, grape-1.x	0s
ruby 3.3, grape-1.x	0s
[allowed to fail] ruby 3.3, grape-edge	0s
ruby 3.1, sequel-4	0s
ruby 3.3, sequel-5	0s
ruby 2.7, ams-0.8.x	0s
ruby 2.7, ams-0.9.x	0s
ruby 3.3, ams-0.10.x	0s
[allowed to fail] ruby head, default	0s
[allowed to fail] ruby head, rails-edge	0s
Required Tests Passed	7s
	4m 54s

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