v3.3.0a12

Alpha release GraphQL-core v3.3.0a12, based on GraphQL.js v17.0.0a7.

This patch-release supports Python 3.10 to 3.14.

Notable improvements since the last alpha release, in addition to the upstream improvements in v17.0.0.a7:

• Add serialization benchmark (#250)
• Use tuples instead of lists for all AST collection fields (#251)
• De-support Python 3.7 to 3.9 (#252)
• Make visitor immutable friendly (#253)
• Fix parser type safety for stricter AST types (#255)
• Convert AST nodes to frozen dataclasses (#256)
• Support custom async iterables (#258)
• Improve type hints using Self (#259)

Thanks to @jkimbo for sponsoring this project, and to @bellini666, @bigfootjon and @corydolphin for contributing to this release.