Remove coveralls

Seems not compatible with cakephp 5

.travis.yml

@@ -1,13 +1,5 @@
 language: php
 php:
   - 8.1
-#  - 8.2
-#  - 8.3
-env:
-  - XDEBUG_MODE=coverage
-before_script:
-  - composer require php-coveralls/php-coveralls --no-interaction
 script:
-  - vendor/bin/phpunit --coverage-clover build/coverage/clover.xml
-after_success:
-  - vendor/bin/coveralls -v
+  - vendor/bin/phpunit