Use the new slot API for the modal #2122

Job	Run time
lint	33s
docker_build	18s
test (ruby 3.0 / rails 6.1.7 )	4m 29s
test (ruby 3.0 / rails 7.0.4 )	4m 41s
test (ruby 3.2.2 / rails 7.1.1 )	4m 14s
test (ruby 3.2.2 / rails 7.0.4 )	4m 25s
test (ruby 3.2.2 / rails 7.0.4 Solr 9.3.0)	4m 32s
test (ruby 3.2.2 / rails 7.0.4 Solr 8.11.2)	4m 20s
test (ruby 3.1 / rails 7.0.4 )	4m 22s
test (ruby 3.1 / rails 7.0.4 / ViewComponent 3)	4m 38s
test (ruby 3.1 / rails 7.0.4 / Propshaft)	4m 20s
test (ruby 3.0 / rails 7.0.4 / Bootstrap 4)	4m 38s
test (ruby 3.0 / rails 7.0.4 / API)	2m 16s
	47m 46s

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