chore!: migrate to Effect v4 - #18

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

test/useEffectSuspenseQueries.test.ts:120:9: Variable 'effectStarted' is assigned a value but never used. Unused variables should start with a '_'.

test/useEffectSuspenseQuery.test.ts:17:7: Class 'NotFoundError' is declared but never used.

test/useEffectQueries.test.ts:155:13: Variable 'result' is declared but never used. Unused variables should start with a '_'.

test/useInfiniteEffectQuery.test.ts:24:7: Class 'NotFoundError' is declared but never used.