Bump minimum WordPress version to 6.6 #11825

Job	Run time
Pre run	4s
Lint: PHP	3m 6s
Lint: CSS	14s
Lint: JS	29s
Static Analysis: PHP	1m 12s
Unit test: PHP 8.0, WP latest	2m 0s
E2E test: JS (1, 2)	4m 49s
Unit test: PHP 8.4, WP trunk	2m 10s
E2E test: JS (2, 2)	3m 55s
Unit test: PHP 8.3, WP trunk	2m 16s
Feature tests: PHP 7.4, WP latest	2m 6s
Unit test: PHP 8.2, WP trunk	2m 37s
Feature tests: PHP 8.4, WP trunk	1m 48s
Unit test: JS	32s
Unit test: PHP 8.1, WP trunk	2m 13s
Feature tests: PHP 8.3, WP trunk	1m 48s
Feature tests: PHP 8.2, WP trunk	1m 50s
Unit test: PHP 8.0, WP trunk Multisite	2m 18s
Unit test (with coverage): PHP 8.0, WP latest	5m 47s
Feature tests: PHP 8.1, WP trunk	1m 50s
Unit test: PHP 8.0, WP latest , Testsuite: external-http	1m 46s
Feature tests: PHP 8.0, WP latest	1m 43s
Unit test: PHP 7.4, WP latest Multisite	1m 59s
Feature tests: PHP 7.4, WP 6.6	1m 42s
Unit test: PHP 7.4, WP latest , Testsuite: external-http	2m 7s
Unit test: PHP 7.4, WP 6.6	1m 59s
Unit test: PHP 7.4, WP 6.6 , Testsuite: external-http	1m 46s
	56m 6s

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