add merge-deep, merge-deep-with and direct tests - #334

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4.2.0, actions/checkout@v2, actions/setup-java@v4, DeLaGuardo/setup-clojure@3.1. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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setup-java v4 is deprecated and will no longer receive updates. Please migrate to actions/setup-java@v5.