Fix workflow api key

Author: randoum

.github/workflows/unittest.yml

@@ -11,7 +11,7 @@ jobs:
         php: [ '7.1', '7.2', '7.3', '7.4' ]
 
     env:
-      EMAIL_VALIDATION_API_KEY: ${{ secrets.API_KEY }}
+      PHONE_VALIDATION_API_KEY: ${{ secrets.API_KEY }}
 
     steps:
       - uses: actions/checkout@master