Use vendor/autoload.php to bootstrap directly

Author: oschwald

phpunit.xml.dist

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="./tests/bootstrap.php" colors="true" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.4/phpunit.xsd" cacheDirectory=".phpunit.cache">
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="./vendor/autoload.php" colors="true" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.4/phpunit.xsd" cacheDirectory=".phpunit.cache">
   <testsuites>
     <testsuite name="GeoIP2 Test Suite">
       <directory suffix="Test.php">./tests/GeoIp2/Test/</directory>