Bump symfony/polyfill-intl-idn from 1.33.0 to 1.38.1 in the composer group across 1 directory #4600

Job	Run time
PHP Static Analysis	1m 5s
PHP Tests (PHP 7.4, WordPress latest)	2m 52s
PHP Tests (PHP 7.4, WordPress 5.3.18)	2m 37s
PHP Lint	3m 47s
PHP Tests (PHP 8.1, WordPress latest)	3m 0s
PHP Tests (PHP 7.4, WordPress nightly)	4m 17s
PHP Tests (PHP 7.4, WordPress latest, Multisite)	3m 11s
PHP Tests (PHP 8.4, WordPress latest)	2m 45s
	23m 34s

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