Version 15.0.0

Major

• Updated the graphql-react peer dependency to ^20.0.0.
• Updated the react-waterfall-render dependency to v5.

Patch

• Updated dev dependencies.
• Use the node: URL scheme for Node.js builtin module imports in tests.
• Migrated from the Node.js builtin module fs to node:fs/promises in tests.
• Replaced the test helper function fsPathRemove with the function rm from the Node.js builtin module node:fs/promises.
• Tweaked the readme.