Missing validation for Dominica phone numbers

[RafyBrens]

Explanation
validator.isMobilePhone cannot validate a good (valid) Dominica phone number.

The dominica number starts with +767, and is followed by 7 digits

Additional context
Validator.js version: v.13.11.0
Node.js version: v23.1.0

[RafyBrens]

Hello! @rubiin @WikiRik
PR made for this issue. PR