Bump tested up to 6.5 #1583

Job	Run time
Pre run	4s
Build: dev build ZIP	1m 49s
E2E test: JS (1, 2)	5m 53s
Build: prod build ZIP	2m 1s
Feature tests: PHP ${{ matrix.php }}, WP ${{ matrix.wp }}	0s
Lint: CSS	0s
E2E test: JS (2, 2)	5m 35s
Lint: JS	0s
Lint: PHP	0s
Static Analysis: PHP	0s
Unit test: JS	0s
Unit test: PHP 8.0, WP latest	24s
Unit test: PHP 8.3, WP trunk	32s
Unit test: PHP 8.2, WP trunk	21s
Unit test: PHP 8.1, WP trunk	21s
Unit test: PHP 8.0, WP trunk	21s
Unit test (with coverage): PHP 8.0, WP latest	21s
Unit test: PHP 8.0, WP latest	23s
Unit test: PHP 7.4, WP latest	24s
Unit test: PHP 7.4, WP latest	22s
Unit test: PHP 7.4, WP 5.3	23s
Unit test: PHP 7.4, WP 5.3	26s
Upload plugin ZIPs to Google Cloud Storage	22s
Comment on PR with links to plugin ZIPs	0s
	20m 2s

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