isMobilePhone with locale es-CU matches numbers of any length > 8 when the number starts with 5

[klaframboise]

Describe the bug
isMobilePhone with locale es-CU matches any string that start with a 5 followed by at least 7 digits. This is because that locale's regex is missing the end of line matcher

Examples
Repl.it demo: https://replit.com/join/vcsakenqug-klaframboise1

Additional context
Validator.js version: 13.9.0
Node.js version: 18.12.1
OS platform: linux + macOS