Remove GraphQL deprecated API call

[alecslupu]

🎩 What? Why?

DeprecatedDSL will be removed from GraphQL-Ruby 2.0, use .to_non_null_type instead of ! and remove .activate from /home/runner/work/decidim/decidim/decidim-core/lib/decidim/core/engine.rb:89:in `block in class:Engine' (called from block in class:Engine at /home/runner/work/decidim/decidim/decidim-core/lib/decidim/core/engine.rb:89)

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📋 Checklist

🚨 Please review the guidelines for contributing to this repository.

• ❓ CONSIDER adding a unit test if your PR resolves an issue.
• ✔️ DO check open PR's to avoid duplicates.
• ✔️ DO keep pull requests small so they can be easily reviewed.
• ✔️ DO build locally before pushing.
• ✔️ DO make sure tests pass.
• ✔️ DO make sure any new changes are documented in docs/.
• ✔️ DO add and modify seeds if necessary.
• ✔️ DO add CHANGELOG upgrade notes if required.
• ✔️ DO add to GraphQL API if there are new public fields.
• ✔️ DO add link to MetaDecidim if it's a new feature.
• ❌AVOID breaking the continuous integration build.
• ❌AVOID making significant changes to the overall architecture.

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♥️ Thank you!

[leio10]

Thanks for taking care of this! ❤️