Bump version to 2.5.5-alpha #1653

Job	Run time
Pre run	5s
E2E test: JS (1, 2)	4m 20s
Build: dev build ZIP	56s
Feature tests: PHP 7.4, WP latest	1m 40s
E2E test: JS (2, 2)	3m 20s
Build: prod build ZIP	1m 23s
Lint: CSS	0s
Feature tests: PHP 8.3, WP trunk	1m 45s
Feature tests: PHP 8.2, WP trunk	1m 59s
Lint: PHP	1m 5s
Feature tests: PHP 8.1, WP trunk	1m 44s
Lint: JS	0s
Static Analysis: PHP	49s
Feature tests: PHP 8.0, WP latest	1m 40s
Feature tests: PHP 7.4, WP 6.3	1m 55s
Unit test: JS	0s
Unit test: PHP 8.0, WP latest	1m 56s
Unit test: PHP 8.3, WP trunk	2m 13s
Unit test: PHP 8.2, WP trunk	2m 5s
Unit test: PHP 8.1, WP trunk	1m 57s
Unit test: PHP 8.0, WP trunk	2m 21s
Unit test (with coverage): PHP 8.0, WP latest	3m 53s
Unit test: PHP 8.0, WP latest	1m 31s
Unit test: PHP 7.4, WP latest	1m 58s
Unit test: PHP 7.4, WP latest	1m 32s
Unit test: PHP 7.4, WP 6.3	2m 1s
Unit test: PHP 7.4, WP 6.3	1m 31s
Upload plugin ZIPs to Google Cloud Storage	22s
Comment on PR with links to plugin ZIPs	0s
	46m 1s

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