Bugfixing/fix postal france code validation

[mash3al-29]

This PR introduces a new regular expression (regex) to improve the validation of French postal codes (locale: FR). The regex ensures that postal codes conform to valid formats as defined by the French postal system.

The newly added regex pattern is:
/^(?:(?:0[1-9]|[1-8]\d|9[0-5])\d{3}|97[1-46]\d{2})$/

This pattern validates postal codes in the ranges of 01000 to 95999 and includes specific handling for overseas french departments.

This fix directly addresses the previously identified bug and ensures that the postal code validation works reliably.

For reference on the structure of French postal codes, please see La Poste, which outlines the valid formats and regulations for postal codes in France.

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)
• References provided in PR (where applicable)