fix(isMobilePhone): correct fa-AF regex to match Afghan mobile numbers

The previous regex matched Afghan landline numbers (prefix 2x/5x) instead
of mobile numbers. Afghan mobile numbers use the 7x prefix (70-79) per
ITU-T E.164, covering operators AWCC (70x), Salaam (71x), MTN (77x),
Etisalat (78x), and Roshan (79x).

Updated test cases to use real Afghan mobile number examples.

Closes #1761

Author: hammadparveez

src/lib/isMobilePhone.js

@@ -160,7 +160,7 @@ const phones = {
   'dz-BT': /^(\+?975|0)?(17|16|77|02)\d{6}$/,
   'ar-YE': /^(((\+|00)9677|0?7)[0137]\d{7}|((\+|00)967|0)[1-7]\d{6})$/,
   'ar-EH': /^(\+?212|0)[\s\-]?(5288|5289)[\s\-]?\d{5}$/,
-  'fa-AF': /^(\+93|0)?(2{1}[0-8]{1}|[3-5]{1}[0-4]{1})(\d{7})$/,
+  'fa-AF': /^(\+?93|0)?7[0-9]\d{7}$/,
   'mk-MK': /^(\+?389|0)?((?:2[2-9]\d{6}|(?:3[1-4]|4[2-8])\d{6}|500\d{5}|5[2-9]\d{6}|7[0-9][2-9]\d{5}|8[1-9]\d{6}|800\d{5}|8009\d{4}))$/,
 };
 /* eslint-enable max-len */

test/validators.test.js

@@ -10946,20 +10946,22 @@ describe('Validators', () => {
       {
         locale: 'fa-AF',
         valid: [
-          '0511231231',
-          '+93511231231',
-          '+93281234567',
+          '+93701234567',
+          '+93771234567',
+          '+93791234567',
+          '0701234567',
+          '0771234567',
+          '701234567',
         ],
         invalid: [
-          '212528812312123',
-          '+212-5290-12312',
-          '++212528812312',
+          '+93201234567',
+          '0511231231',
+          '+93511231231',
           '12345',
           'Afghanistan',
           'this should fail',
-          '212  5288---12312',
-          '+503 1111 1111',
-          '00 +503 1234 5678',
+          '++93701234567',
+          '00 +93 701 234 567',
         ],
       },
       {