Summary of Changes

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This pull request prepares for the v5 release by focusing on significant development environment updates, dependency management improvements, and internal utility refinements. It includes a complete migration of the ESLint configuration to the modern flat config format, enhances Dependabot's update strategy with dependency grouping, and updates the action's documentation and core xcrun function for better output handling and stability.

Highlights

• ESLint Configuration Migration: Migrated the ESLint setup from the legacy .eslintrc.json and .eslintignore files to the new flat configuration system using eslint.config.mjs, integrating TypeScript, Jest, and Prettier.
• Dependabot Configuration Enhancements: Updated the Dependabot configuration to introduce grouped updates for GitHub Actions and npm development/production dependencies, and adjusted the update schedule to weekly for better management.
• v5 Release Features: Added new entries to CHANGELOG.md for v5, including a fix for flaky boot issues with a retry parameter and improved printing of stdout/stderr even when commands fail.
• Documentation and Dependency Updates: Updated README.md to reflect the v5 action version and modernized the build status badge. Numerous development dependencies in package.json were also upgraded.
• Improved xcrun Output Handling: Modified the xcrun utility function to correctly handle stdout and stderr as Buffer types, ensuring proper string conversion for logging and return values.

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