Fix Ruby 3 kwargs deprecation in ManifestTypeEnum

What does this MR do and why?

Extracted from our Ruby 3 branch: !70798 (comment 909718200)

It gives warnings on master which uses Ruby 2.7:

DEPRECATION WARNING: /Users/lipton/dev/gitlab/gitlab-development-kit/gitlab/app/graphql/types/dependency_proxy/manifest_type_enum.rb:8: 
warning: Using the last argument as keyword parameters is deprecated; 
maybe ** should be added to the call
/Users/lipton/dev/gitlab/gitlab-development-kit/gitlab/app/graphql/types/base_enum.rb:55: 
warning: The called method `value' is defined here 
(called from block in <class:ManifestTypeEnum> 
at /Users/lipton/dev/gitlab/gitlab-development-kit/gitlab/app/graphql/types/dependency_proxy/manifest_type_enum.rb:8)

It breaks on Ruby 3.

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