Bump sabberworm/php-css-parser from 8.5.1 to 8.7.0 #11653

Job	Run time
Pre run	6s
Lint: JS	1m 1s
Lint: PHP	15s
Static Analysis: PHP	14s
Unit test: JS	1m 4s
Lint: CSS	0s
Unit test: PHP 8.0, WP latest	34s
Unit test: PHP 8.3, WP trunk	51s
E2E test: JS (1, 2)	1m 8s
Unit test: PHP 8.2, WP trunk	42s
E2E test: JS (2, 2)	52s
Unit test: PHP 8.1, WP trunk	35s
Unit test: PHP 8.0, WP trunk	42s
Unit test (with coverage): PHP 8.0, WP latest	39s
Unit test: PHP 8.0, WP latest	53s
Feature tests: PHP 7.4, WP latest	32s
Unit test: PHP 7.4, WP latest	35s
Feature tests: PHP 8.3, WP trunk	45s
Unit test: PHP 7.4, WP latest	42s
Feature tests: PHP 8.2, WP trunk	34s
Unit test: PHP 7.4, WP 6.5	42s
Feature tests: PHP 8.1, WP trunk	40s
Unit test: PHP 7.4, WP 6.5	36s
Feature tests: PHP 8.0, WP latest	36s
Feature tests: PHP 7.4, WP 6.5	1m 6s
Build: ${{ matrix.build }} build ZIP	0s
Upload plugin ZIPs to Google Cloud Storage	0s
Comment on PR with links to plugin ZIPs	0s
	16m 24s

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