refactor: use arrow functions in more places #1729

Job	Run time
Entrypoint low-PHP compat	11s
PHP 7.4 Fixer with lowest deps	1m 2s
PHP 7.4 tests with lowest deps	3m 27s
PHP 8.0 Fixer	1m 0s
PHP 8.0 tests	3m 6s
PHP 8.1 Fixer with Symfony ^6	1m 5s
PHP 8.1 tests with Symfony ^6	3m 38s
PHP 8.2 Fixer	1m 8s
PHP 8.2 tests	3m 49s
PHP 8.3 Fixer	1m 4s
PHP 8.3 tests	3m 24s
PHP 8.3 Fixer with migration rules	1m 21s
PHP 8.3 tests with migration rules	4m 21s
PHP 8.3 Fixer with Symfony ^7	1m 10s
PHP 8.3 tests with Symfony ^7	3m 23s
PHP 8.3 code coverage	4m 28s
PHP 8.3 mutation tests	23s
PHP 8.3 Fixer on Windows	1m 52s
PHP 8.3 tests on Windows	2m 24s
PHP 8.3 Fixer on macOS	2m 12s
PHP 8.3 tests on macOS	2m 2s
PHP 8.4 Fixer	55s
PHP 8.4 tests	3m 39s
Deployment checks	39s
	51m 43s

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