Bump minimum WordPress version to 6.6 #11826

Job	Run time
Pre run	3s
Lint: CSS	14s
Static Analysis: PHP	1m 11s
Lint: JS	35s
Unit test: JS	42s
Unit test: PHP 8.0, WP latest	2m 16s
Lint: PHP	2m 56s
Unit test: PHP 8.4, WP trunk	2m 15s
E2E test: JS (1, 2)	4m 55s
Unit test: PHP 8.3, WP trunk	2m 8s
E2E test: JS (2, 2)	3m 33s
Unit test: PHP 8.2, WP trunk	2m 40s
Feature tests: PHP 7.4, WP latest	1m 44s
Unit test: PHP 8.1, WP trunk	2m 12s
Feature tests: PHP 8.4, WP trunk	1m 50s
Unit test: PHP 8.0, WP trunk Multisite	2m 20s
Feature tests: PHP 8.3, WP trunk	1m 49s
Unit test (with coverage): PHP 8.0, WP latest	5m 11s
Feature tests: PHP 8.2, WP trunk	1m 49s
Unit test: PHP 8.0, WP latest , Testsuite: external-http	2m 10s
Feature tests: PHP 8.1, WP trunk	2m 8s
Unit test: PHP 7.4, WP latest Multisite	2m 16s
Feature tests: PHP 8.0, WP latest	2m 1s
Unit test: PHP 7.4, WP latest , Testsuite: external-http	3m 5s
Unit test: PHP 7.4, WP 6.6	2m 19s
Feature tests: PHP 7.4, WP 6.6	1m 47s
Unit test: PHP 7.4, WP 6.6 , Testsuite: external-http	1m 45s
	57m 54s

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