Update friendsofphp/php-cs-fixer requirement from ^3.70 to ^3.71 (#140) #238

Job	Run time
phpunit (ubuntu-latest, 8.2, tests-e2e/bug52/, vendor/bin/phpstan analyse )	12s
phpunit (ubuntu-latest, 8.2, tests-e2e/github/, diff -w <(vendor/bin/phpstan analyse --error-form...	8s
phpunit (ubuntu-latest, 8.2, tests-e2e/jira/, diff -w <(vendor/bin/phpstan analyse --error-format...	8s
phpunit (ubuntu-latest, 8.2, tests-e2e/youtrack/, diff -w <(vendor/bin/phpstan analyse --error-fo...	10s
	38s

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