Remove usage of Base64Bp
What does this MR do and why?
This was used by the GraphQL gem to support Ruby <2.5. Support for old Ruby has been removed and this is no longer needed.
See https://github.com/rmosolgo/graphql-ruby/pull/4820
Since this is only used in tests, and GitLab does not support Ruby 2.5 and lower, we can just use the Base64
class here.
Extracted from !146295 (merged) to prevent failures like https://gitlab.com/gitlab-org/gitlab/-/jobs/6288575829
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Edited by Heinrich Lee Yu