Test multiple node versions

[SumiyaE]

Description

Add Node.js 24 to the test matrix for both unit tests and integration tests.

Changes:

• test-lint.yml: Added Node.js 24 to the matrix ([20, 22] → [20, 22, 24])
• integration-test.yml: Added matrix strategy with Node.js 20, 22, 24

Related Issues

• Closes Update testing strategy to test multiple node versions #257

Type of Change

Other: CI configuration update

Testing

• I ran npm run check
• CI passes on Node.js 20, 22, 24　

SumiyaE#1

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly (N/A - CI changes only)
• I have added an appropriate example to the documentation (N/A)
• My changes generate no new warnings
• Any dependent changes have been merged and published (N/A)