Update dependency graphql-client to v0.21.0

This MR contains the following updates:

Package	Type	Update	Change
graphql-client	ironbank-rubygems	minor	0.20.0 -> 0.21.0

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Release Notes

github-community-projects/graphql-client (graphql-client)

v0.21.0

Compare Source

What's Changed

• Broken error links. by @​mikdiet in https://github.com/github-community-projects/graphql-client/pull/11
• Remove unused local variable by @​meganemura in https://github.com/github-community-projects/graphql-client/pull/13
• Add and improve the tests for Date/DateTime types by @​meganemura in https://github.com/github-community-projects/graphql-client/pull/14
• Allow new enum values config by @​ElvinEfendi in https://github.com/github-community-projects/graphql-client/pull/12
• add to_hash alias to to_h method of ObjectType and Response by @​ElvinEfendi in https://github.com/github-community-projects/graphql-client/pull/16

New Contributors

• @​mikdiet made their first contribution in https://github.com/github-community-projects/graphql-client/pull/11
• @​meganemura made their first contribution in https://github.com/github-community-projects/graphql-client/pull/13
• @​ElvinEfendi made their first contribution in https://github.com/github-community-projects/graphql-client/pull/12

Full Changelog: https://github.com/github-community-projects/graphql-client/compare/v0.20.0...v0.21.0

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