Bump eslint from 8.57.0 to 9.21.0 #1797

Job	Run time
Pre run	5s
Lint: JS	42s
Lint: CSS	56s
Lint: PHP	0s
Static Analysis: PHP	0s
Unit test: JS	1m 1s
Unit test: PHP 8.0, WP latest	31s
Unit test: PHP 8.4, WP trunk	33s
E2E test: JS (1, 2)	5m 38s
Unit test: PHP 8.3, WP trunk	1m 53s
E2E test: JS (2, 2)	5m 16s
Feature tests: PHP ${{ matrix.php }}, WP ${{ matrix.wp }}	0s
Unit test: PHP 8.2, WP trunk	31s
Unit test: PHP 8.1, WP trunk	1m 27s
Unit test: PHP 8.0, WP trunk Multisite	30s
Unit test (with coverage): PHP 8.0, WP latest	31s
Unit test: PHP 8.0, WP latest , Testsuite: external-http	34s
Unit test: PHP 7.4, WP latest Multisite	29s
Unit test: PHP 7.4, WP latest , Testsuite: external-http	1m 32s
Unit test: PHP 7.4, WP 6.6	1m 27s
Unit test: PHP 7.4, WP 6.6 , Testsuite: external-http	1m 26s
	25m 2s

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