Bump sabberworm/php-css-parser from 8.5.1 to 8.6.0 #11568

Job	Run time
Pre run	7s
Lint: JS	33s
E2E test: JS (1, 2)	29s
E2E test: JS (2, 2)	33s
Feature tests: PHP 7.4, WP latest	33s
Lint: CSS	0s
Feature tests: PHP 8.3, WP trunk	37s
Lint: PHP	22s
Feature tests: PHP 8.2, WP trunk	43s
Static Analysis: PHP	22s
Unit test: JS	24s
Feature tests: PHP 8.1, WP trunk	34s
Feature tests: PHP 8.0, WP latest	36s
Unit test: PHP 8.0, WP latest	43s
Build: ${{ matrix.build }} build ZIP	0s
Feature tests: PHP 7.4, WP 6.3	33s
Unit test: PHP 8.3, WP trunk	33s
Unit test: PHP 8.2, WP trunk	41s
Unit test: PHP 8.1, WP trunk	36s
Unit test: PHP 8.0, WP trunk	44s
Unit test (with coverage): PHP 8.0, WP latest	43s
Unit test: PHP 8.0, WP latest	39s
Unit test: PHP 7.4, WP latest	38s
Unit test: PHP 7.4, WP latest	44s
Unit test: PHP 7.4, WP 6.3	36s
Unit test: PHP 7.4, WP 6.3	39s
Upload plugin ZIPs to Google Cloud Storage	0s
Comment on PR with links to plugin ZIPs	0s
	13m 42s

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