String length checks inaccurate for unicode supplemental plane - update 'validator' library to ^13.9.0

[davidwoodmansee]

The string length is not computed correctly for certain unicode multibyte presentational sequences (such as emojis with a color attribute. e.g. "✔️").

the issue stems from the 'validator' library but a fix was merged and released as 13.9.0

the fix was here: validatorjs/validator.js#1967

However, this package is still using 13.6.0, so that needs to be updated to at least 13.9.0.