feat(package): set sideEffects to false for better tree-shakability - #883

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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: lidofinance/gh-find-current-pr@15e7a49f2d3f153952a3aa5e6ad6cfe07f770bd5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/