Update dependencies

[timea-solid]

Updated:

• eslint
• jest
• typescript

[Copilot]

Pull Request Overview

This PR updates key development dependencies to their latest major versions, including eslint, jest, and typescript, while also migrating ESLint configuration to the new flat config format.

• Updates major dependencies: eslint (v8 → v9), jest (v29 → v30), typescript (v4 → v5)
• Migrates from legacy .eslintrc to modern eslint.config.mjs flat configuration
• Bumps package version from 2.4.27 to 2.5.0 to reflect breaking changes

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
package.json	Updates dependency versions and package version bump
eslint.config.mjs	New flat ESLint configuration file
.eslintrc	Removes legacy ESLint configuration

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