Improve PHP 8.4 compatibility #11661

Job	Run time
Pre run	4s
Build: dev build ZIP	54s
E2E test: JS (1, 2)	7m 14s
Lint: CSS	14s
E2E test: JS (2, 2)	3m 26s
Build: prod build ZIP	1m 10s
Feature tests: PHP 7.4, WP latest	1m 42s
Feature tests: PHP 8.4, WP trunk	1m 47s
Lint: JS	30s
Lint: PHP	48s
Static Analysis: PHP	1m 15s
Feature tests: PHP 8.3, WP trunk	1m 45s
Feature tests: PHP 8.2, WP trunk	1m 51s
Unit test: JS	37s
Feature tests: PHP 8.1, WP trunk	1m 51s
Unit test: PHP 8.0, WP latest	1m 58s
Feature tests: PHP 8.0, WP latest	1m 54s
Unit test: PHP 8.4, WP trunk	1m 53s
Unit test: PHP 8.3, WP trunk	1m 57s
Feature tests: PHP 7.4, WP 6.5	1m 52s
Unit test: PHP 8.2, WP trunk	2m 33s
Unit test: PHP 8.1, WP trunk	1m 53s
Unit test: PHP 8.0, WP trunk	2m 23s
Unit test (with coverage): PHP 8.0, WP latest	4m 12s
Unit test: PHP 8.0, WP latest	1m 25s
Unit test: PHP 7.4, WP latest	2m 21s
Unit test: PHP 7.4, WP latest	1m 36s
Unit test: PHP 7.4, WP 6.5	2m 0s
Unit test: PHP 7.4, WP 6.5	1m 51s
Upload plugin ZIPs to Google Cloud Storage	27s
Comment on PR with links to plugin ZIPs	0s
	55m 23s

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