Fix codecov.yml

Signed-off-by: Alex Karajos <alex.merlin.1985@gmail.com>

Author: alexmerlin

.github/workflows/codecov.yml

@@ -43,7 +43,7 @@ jobs:
 
       - name: Install dependencies with composer
         env:
-          COMPOSER_DEV_MODE=1
+          COMPOSER_DEV_MODE: 1
         run: composer install --prefer-dist --no-interaction --no-progress --optimize-autoloader --ansi
 
       - name: Collect code coverage with PHPUnit