Update Changelog for 21.7.0-rc.1 #131909

Job	Run time
Compute previous WordPress version	3s
Mobile	0s
Build JavaScript assets for PHP unit tests	5m 19s
JavaScript Date Tests (Node.js 24)	44s
PHP coding standards	22s
JavaScript Date Tests (Node.js 22)	52s
JavaScript Date Tests (Node.js 20)	44s
JavaScript (Node.js 20) 3/4	1m 53s
JavaScript (Node.js 22) 1/4	2m 19s
JavaScript (Node.js 24) 3/4	1m 48s
JavaScript (Node.js 24) 1/4	2m 0s
JavaScript (Node.js 22) 3/4	1m 49s
JavaScript (Node.js 22) 2/4	1m 53s
JavaScript (Node.js 20) 4/4	1m 55s
JavaScript (Node.js 20) 2/4	2m 5s
JavaScript (Node.js 24) 4/4	1m 51s
JavaScript (Node.js 24) 2/4	1m 54s
JavaScript (Node.js 22) 4/4	1m 56s
JavaScript (Node.js 20) 1/4	2m 21s
PHP 7.2 multisite on Linux	2m 41s
PHP 7.3 multisite on Linux	2m 36s
PHP 7.2 on Linux	2m 42s
PHP 8.0 multisite on Linux	2m 44s
PHP 7.4 on Linux	2m 28s
PHP 7.4 multisite on Linux	2m 52s
PHP 8.0 on Linux	2m 51s
PHP 7.3 on Linux	2m 44s
PHP 8.2 multisite on Linux	2m 27s
PHP 8.2 on Linux	2m 29s
PHP 8.1 multisite on Linux	2m 57s
PHP 8.3 multisite on Linux	2m 23s
PHP 8.3 on Linux	2m 44s
PHP 7.4 (WP previous major version) on Linux	2m 48s
PHP 7.2 (WP previous major version) on Linux	2m 37s
PHP 8.3 (WP previous major version) on Linux	3m 38s
PHP 8.1 on Linux	2m 33s
PHP	3s
	1h 18m 5s

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