Improve PHP 8.4 compatibility #11662

Job	Run time
Pre run	4s
Lint: CSS	21s
Build: dev build ZIP	1m 14s
Feature tests: PHP 7.4, WP latest	1m 43s
Build: prod build ZIP	1m 29s
Feature tests: PHP 8.4, WP trunk	2m 5s
E2E test: JS (1, 2)	7m 23s
E2E test: JS (2, 2)	3m 59s
Feature tests: PHP 8.3, WP trunk	1m 51s
Feature tests: PHP 8.2, WP trunk	1m 47s
Lint: JS	27s
Lint: PHP	44s
Feature tests: PHP 8.1, WP trunk	1m 53s
Feature tests: PHP 8.0, WP latest	1m 42s
Static Analysis: PHP	1m 8s
Feature tests: PHP 7.4, WP 6.5	1m 49s
Unit test: JS	41s
Unit test: PHP 8.0, WP latest	2m 8s
Unit test: PHP 8.4, WP trunk	2m 17s
Unit test: PHP 8.3, WP trunk	1m 59s
Unit test: PHP 8.2, WP trunk	2m 21s
Unit test: PHP 8.1, WP trunk	2m 2s
Unit test: PHP 8.0, WP trunk	1m 57s
Unit test (with coverage): PHP 8.0, WP latest	3m 54s
Unit test: PHP 8.0, WP latest	1m 28s
Unit test: PHP 7.4, WP latest	2m 24s
Unit test: PHP 7.4, WP latest	1m 56s
Unit test: PHP 7.4, WP 6.5	2m 22s
Unit test: PHP 7.4, WP 6.5	1m 53s
Upload plugin ZIPs to Google Cloud Storage	26s
Comment on PR with links to plugin ZIPs	0s
	57m 27s

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