Add missing semicolon for code style consistency

[Copilot]

Addresses review feedback on #23 regarding inconsistent semicolon usage in lib/google-font-list.js.

Changes

• Added semicolon to line 113 where 91% of statements in the function use explicit semicolons

// Before
var error = new Error('Failed to parse GWFH Fonts JSON: ' + /** @type {Error} */ (e).message)

// After  
var error = new Error('Failed to parse GWFH Fonts JSON: ' + /** @type {Error} */ (e).message);

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