Bump phpstan/phpstan from 1.12.14 to 2.1.2 #1776

Job	Run time
Pre run	4s
Lint: JS	1m 5s
Lint: CSS	0s
Lint: PHP	46s
E2E test: JS (1, 2)	5m 43s
E2E test: JS (2, 2)	4m 32s
Feature tests: PHP 7.4, WP latest	2m 59s
Feature tests: PHP 8.4, WP trunk	2m 37s
Unit test: JS	1m 6s
Static Analysis: PHP	14s
Feature tests: PHP 8.3, WP trunk	2m 30s
Feature tests: PHP 8.2, WP trunk	2m 38s
Feature tests: PHP 8.1, WP trunk	2m 59s
Unit test: PHP 8.0, WP latest	2m 42s
Feature tests: PHP 8.0, WP latest	2m 54s
Feature tests: PHP 7.4, WP 6.6	2m 54s
Unit test: PHP 8.4, WP trunk	2m 6s
Unit test: PHP 8.3, WP trunk	2m 17s
Unit test: PHP 8.2, WP trunk	1m 57s
Unit test: PHP 8.1, WP trunk	2m 41s
Unit test: PHP 8.0, WP trunk Multisite	2m 52s
Unit test (with coverage): PHP 8.0, WP latest	4m 22s
Unit test: PHP 8.0, WP latest , Testsuite: external-http	2m 27s
Unit test: PHP 7.4, WP latest Multisite	2m 37s
Unit test: PHP 7.4, WP latest , Testsuite: external-http	2m 6s
Unit test: PHP 7.4, WP 6.6	2m 15s
Unit test: PHP 7.4, WP 6.6 , Testsuite: external-http	2m 5s
	1h 3m 28s

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