Bump @testing-library/react from 14.2.1 to 15.0.7 #1623

Job	Run time
Pre run	3s
Lint: JS	1m 6s
Lint: CSS	56s
E2E test: JS (1, 2)	2m 17s
Lint: PHP	0s
Static Analysis: PHP	0s
Unit test: JS	1m 4s
E2E test: JS (2, 2)	2m 18s
Unit test: PHP 8.0, WP latest	24s
Feature tests: PHP ${{ matrix.php }}, WP ${{ matrix.wp }}	0s
Build: ${{ matrix.build }} build ZIP	0s
Unit test: PHP 8.3, WP trunk	26s
Unit test: PHP 8.2, WP trunk	26s
Unit test: PHP 8.1, WP trunk	27s
Unit test: PHP 8.0, WP trunk	31s
Unit test (with coverage): PHP 8.0, WP latest	21s
Unit test: PHP 8.0, WP latest	26s
Unit test: PHP 7.4, WP latest	23s
Unit test: PHP 7.4, WP latest	21s
Unit test: PHP 7.4, WP 5.3	21s
Unit test: PHP 7.4, WP 5.3	22s
Upload plugin ZIPs to Google Cloud Storage	0s
Comment on PR with links to plugin ZIPs	0s
	12m 12s

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