Fix issue where nowdocs with whitespace before labels are not detected #566

Job	Run time
Check previous runs	12s
Check generated files and formatting	14s
PHPStan (8.4)	16s
PHPUnit tests (ubuntu-24.04, 8.4)	1m 37s
PHPStan (7.4)	14s
PHPUnit tests (windows-latest, 8.4)	2m 24s
PHPUnit tests (macos-latest, 8.4)	2m 8s
PHPUnit tests (ubuntu-24.04, 8.3)	1m 37s
PHPUnit tests (ubuntu-24.04, 8.2)	1m 31s
PHPUnit tests (ubuntu-24.04, 8.1)	1m 35s
PHPUnit tests (ubuntu-24.04, 8.0)	1m 33s
PHPUnit tests (ubuntu-24.04, 7.4)	1m 26s
Build phar and man page	1m 38s
Integration tests (laravel/framework, --include-if-php --preset laravel src tests bin, --quiet --...	1m 22s
Test phar (ubuntu-24.04, 8.4)	14s
Integration tests (drupal/drupal, --exclude '/\/(\.git\|\.hg\|\.svn\|_?build\|dist\|vendor\|core\/lib\/...	4m 48s
Test phar (windows-latest, 8.4)	31s
Integration tests (symfony/symfony, --include-if-php --preset symfony ., --quiet --timers)	6m 29s
Test phar (macos-latest, 8.4)	1m 16s
Integration tests (WordPress/WordPress, --include-if-php --preset wordpress ., --quiet --timers -...	2m 1s
Test phar (ubuntu-24.04, 8.3)	13s
Test phar (ubuntu-24.04, 8.2)	8s
Test phar (ubuntu-24.04, 8.1)	14s
Test phar (ubuntu-24.04, 8.0)	14s
Test phar (ubuntu-24.04, 7.4)	11s
	34m 6s

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