Replaced Firefox with Chromium for Selenium tests #147

Job	Run time
Visual tests	38s
Run tox environment quality	30s
build (Python 3.10, Django 4.2)	1m 1s
Run tox environment dist-validation	22s
build (Python 3.10, Django 5.0)	1m 18s
build (Python 3.10, Django 5.1)	1m 9s
build (Python 3.10, Django main)	1m 40s
build (Python 3.11, Django 4.2)	58s
build (Python 3.11, Django 5.0)	1m 0s
build (Python 3.11, Django 5.1)	1m 0s
build (Python 3.11, Django main)	1m 28s
build (Python 3.12, Django 4.2)	1m 18s
build (Python 3.12, Django 5.0)	1m 19s
build (Python 3.12, Django 5.1)	1m 11s
build (Python 3.12, Django main)	1m 59s
build (Python 3.8, Django 4.2)	1m 8s
build (Python 3.9, Django 4.2)	1m 2s
	19m 1s

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