Bump sabberworm/php-css-parser from 8.5.1 to 8.7.0 #1721

Job	Run time
Pre run	6s
Lint: JS	1m 4s
Lint: PHP	15s
E2E test: JS (1, 2)	53s
Lint: CSS	0s
E2E test: JS (2, 2)	54s
Static Analysis: PHP	21s
Unit test: JS	57s
Unit test: PHP 8.0, WP latest	37s
Feature tests: PHP 7.4, WP latest	33s
Unit test: PHP 8.3, WP trunk	36s
Feature tests: PHP 8.3, WP trunk	33s
Unit test: PHP 8.2, WP trunk	43s
Feature tests: PHP 8.2, WP trunk	35s
Unit test: PHP 8.1, WP trunk	42s
Feature tests: PHP 8.1, WP trunk	47s
Unit test: PHP 8.0, WP trunk	36s
Unit test (with coverage): PHP 8.0, WP latest	39s
Feature tests: PHP 8.0, WP latest	36s
Unit test: PHP 8.0, WP latest	39s
Unit test: PHP 7.4, WP latest	38s
Unit test: PHP 7.4, WP latest	43s
Feature tests: PHP 7.4, WP 6.5	34s
Unit test: PHP 7.4, WP 6.5	35s
Unit test: PHP 7.4, WP 6.5	45s
Build: ${{ matrix.build }} build ZIP	0s
Upload plugin ZIPs to Google Cloud Storage	0s
Comment on PR with links to plugin ZIPs	0s
	15m 21s

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