add phpunit code coverage driver

vendor/phpunit/php-code-coverage/src/Report/PHP.php

@@ -12,7 +12,6 @@ namespace SebastianBergmann\CodeCoverage\Report;
 use function dirname;
 use function file_put_contents;
 use function serialize;
-use function sprintf;
 use SebastianBergmann\CodeCoverage\CodeCoverage;
 use SebastianBergmann\CodeCoverage\Driver\WriteOperationFailedException;
 use SebastianBergmann\CodeCoverage\Util\Filesystem;
@@ -21,14 +20,8 @@ final class PHP
 {
     public function process(CodeCoverage $coverage, ?string $target = null): string
     {
-        $buffer = sprintf(
-            "<?php
-return \unserialize(<<<'END_OF_COVERAGE_SERIALIZATION'%s%s%sEND_OF_COVERAGE_SERIALIZATION%s);",
-            PHP_EOL,
-            serialize($coverage),
-            PHP_EOL,
-            PHP_EOL
-        );
+        $buffer = "<?php
+return \unserialize(<<<'END_OF_COVERAGE_SERIALIZATION'" . PHP_EOL . serialize($coverage) . PHP_EOL . 'END_OF_COVERAGE_SERIALIZATION' . PHP_EOL . ');';
 
         if ($target !== null) {
             Filesystem::createDirectory(dirname($target));