Bump Nodejs; Fix PHPStan and PHPUnit failures #11396

Job	Run time
Pre run	3s
Static Analysis: PHP	45s
Lint: JS	27s
Lint: CSS	13s
Lint: PHP	38s
E2E test: JS (1, 2)	4m 33s
E2E test: JS (2, 2)	3m 54s
Unit test: JS	42s
Feature tests: PHP 7.4, WP latest	1m 49s
Unit test: PHP 8.0, WP latest	2m 10s
Unit test: PHP 8.3, WP trunk	2m 3s
Build: dev build ZIP	1m 23s
Unit test: PHP 8.2, WP trunk	1m 56s
Unit test: PHP 8.1, WP trunk	2m 21s
Build: prod build ZIP	1m 25s
Feature tests: PHP 8.3, WP trunk	1m 42s
Unit test: PHP 8.0, WP trunk	1m 57s
Feature tests: PHP 8.2, WP trunk	2m 5s
Unit test (with coverage): PHP 8.0, WP latest	4m 15s
Feature tests: PHP 8.1, WP trunk	1m 57s
Unit test: PHP 8.0, WP latest	1m 38s
Feature tests: PHP 8.0, WP latest	2m 2s
Unit test: PHP 7.4, WP latest	2m 8s
Feature tests: PHP 7.4, WP 5.3	1m 43s
Unit test: PHP 7.4, WP latest	1m 56s
Unit test: PHP 7.4, WP 5.3	2m 5s
Unit test: PHP 7.4, WP 5.3	1m 49s
Upload plugin ZIPs to Google Cloud Storage	34s
Comment on PR with links to plugin ZIPs	4s
	50m 17s

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