chore(tests): cover PHP 8.3 #1732

Job	Run time
acceptance-tests-firefox (8.3, firefox, bootstrap3-banner)	2m 32s
acceptance-tests (8.1, chrome, bootstrap3-banner)	2m 30s
acceptance-tests-firefox (8.3, firefox, bootstrap3-modal)	3m 8s
acceptance-tests (8.1, chrome, bootstrap3-modal)	2m 16s
acceptance-tests-firefox (8.3, firefox, bootstrap4-modal)	2m 37s
acceptance-tests (8.1, chrome, bootstrap4-modal)	2m 18s
acceptance-tests-firefox (8.3, firefox, bootstrap5-modal)	2m 38s
acceptance-tests (8.1, chrome, bootstrap5-modal)	2m 17s
acceptance-tests-firefox (8.3, firefox, customtheme)	2m 26s
acceptance-tests (8.1, chrome, customtheme)	2m 17s
acceptance-tests (8.2, chrome, bootstrap3-banner)	2m 21s
acceptance-tests (8.2, chrome, bootstrap3-modal)	2m 15s
acceptance-tests (8.2, chrome, bootstrap4-modal)	2m 17s
acceptance-tests (8.2, chrome, bootstrap5-modal)	2m 16s
acceptance-tests (8.2, chrome, customtheme)	2m 18s
acceptance-tests (8.3, chrome, bootstrap3-banner)	2m 14s
acceptance-tests (8.3, chrome, bootstrap3-modal)	2m 19s
acceptance-tests (8.3, chrome, bootstrap4-modal)	2m 18s
acceptance-tests (8.3, chrome, bootstrap5-modal)	2m 28s
acceptance-tests (8.3, chrome, customtheme)	2m 18s
	48m 3s

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