Use the new slot API for the modal #2129

Job	Run time
lint	35s
docker_build	17s
test (ruby 3.0 / rails 6.1.7 )	4m 40s
test (ruby 3.0 / rails 7.0.4 )	4m 16s
test (ruby 3.2.2 / rails 7.1.1 )	4m 36s
test (ruby 3.2.2 / rails 7.0.4 )	4m 21s
test (ruby 3.2.2 / rails 7.0.4 Solr 9.3.0)	4m 15s
test (ruby 3.2.2 / rails 7.0.4 Solr 8.11.2)	4m 9s
test (ruby 3.1 / rails 7.0.4 )	4m 34s
test (ruby 3.1 / rails 7.0.4 / ViewComponent 3)	4m 27s
test (ruby 3.1 / rails 7.0.4 / Propshaft)	4m 8s
test (ruby 3.0 / rails 7.0.4 / Bootstrap 4)	4m 10s
test (ruby 3.0 / rails 7.0.4 / API)	2m 20s
	46m 48s

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