Update dependencies to newer versions and ensure tests pass

[Copilot]

Upgrades dependencies to newer versions, fixes coverage reporting in CI, and ensures all tests pass.

Changes Made

• nyc: Upgraded from ^17.1.0 to ^18.0.0
• fs-extra: Upgraded from ^11.1.1 to ^11.3.4
• coveralls: Upgraded from ^3.0.2 to ^3.1.1
• engines: Updated Node.js requirement from >=12.0 to >=18.0 to match the tested Node versions
• build.yml: Fixed flag-name in Coveralls step — was referencing undefined matrix.test_number, corrected to matrix.node-version
• build.yml: Updated coverallsapp/github-action@master to the stable pinned version @v2

Testing

• ✅ All 289 tests pass with the updated dependencies

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[albe]

@copilot try again

[Copilot]

@copilot try again

Done in ae59c21. Changes made:

• Upgraded nyc ^17.1.0 → ^18.0.0, fs-extra ^11.1.1 → ^11.3.4, coveralls ^3.0.2 → ^3.1.1
• Fixed flag-name in build.yml — was referencing undefined matrix.test_number, corrected to matrix.node-version
• Updated coverallsapp/github-action@master to @v2 (stable pinned version)
• Updated engines field to >=18.0 to match the tested Node versions
• All 289 tests pass locally

[coveralls]

coverage: 97.875%. remained the same
when pulling ae59c21 on copilot/upgrade-dependencies-and-check-tests
into bc5fb3d on main.