Improve PHP 8.4 compatibility #11668

Job	Run time
Pre run	5s
Lint: CSS	14s
Static Analysis: PHP	1m 15s
Lint: JS	32s
E2E test: JS (1, 2)	7m 27s
E2E test: JS (2, 2)	3m 40s
Lint: PHP	1m 12s
Unit test: JS	37s
Unit test: PHP 8.0, WP latest	2m 22s
Feature tests: PHP 7.4, WP latest	2m 16s
Unit test: PHP 8.4, WP trunk	2m 1s
Feature tests: PHP 8.4, WP trunk	2m 1s
Unit test: PHP 8.3, WP trunk	2m 40s
Feature tests: PHP 8.3, WP trunk	1m 59s
Unit test: PHP 8.2, WP trunk	1m 59s
Unit test: PHP 8.1, WP trunk	2m 19s
Unit test: PHP 8.0, WP trunk	1m 54s
Feature tests: PHP 8.2, WP trunk	2m 0s
Unit test (with coverage): PHP 8.0, WP latest	4m 1s
Feature tests: PHP 8.1, WP trunk	1m 48s
Unit test: PHP 8.0, WP latest	1m 52s
Feature tests: PHP 8.0, WP latest	1m 56s
Unit test: PHP 7.4, WP latest	2m 3s
Feature tests: PHP 7.4, WP 6.5	1m 40s
Unit test: PHP 7.4, WP latest	1m 34s
Unit test: PHP 7.4, WP 6.5	2m 4s
Unit test: PHP 7.4, WP 6.5	1m 33s
	55m 4s

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