Bump webpackbar from 5.0.2 to 6.0.0 #1541

Job	Run time
Pre run	3s
Lint: CSS	1m 14s
Lint: JS	1m 19s
Feature tests: PHP ${{ matrix.php }}, WP ${{ matrix.wp }}	0s
E2E test: JS (1, 2)	11m 28s
E2E test: JS (2, 2)	5m 53s
Lint: PHP	0s
Static Analysis: PHP	0s
Unit test: JS	1m 22s
Unit test: PHP 8.0, WP latest	25s
Unit test: PHP 8.3, WP trunk	23s
Unit test: PHP 8.2, WP trunk	23s
Build: ${{ matrix.build }} build ZIP	0s
Unit test: PHP 8.1, WP trunk	22s
Unit test: PHP 8.0, WP trunk	23s
Unit test (with coverage): PHP 8.0, WP latest	26s
Unit test: PHP 8.0, WP latest	27s
Unit test: PHP 7.4, WP latest	27s
Unit test: PHP 7.4, WP latest	24s
Unit test: PHP 7.4, WP 5.3	23s
Unit test: PHP 7.4, WP 5.3	25s
Upload plugin ZIPs to Google Cloud Storage	0s
Comment on PR with links to plugin ZIPs	0s
	25m 47s

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