Fixed incorrect type-hint for Repository Exceptions contracts #1295

Job	Run time
Unit tests & SQLite integration tests (7.4)	11m 45s
Solr integration tests (7.4)	12m 32s
Unit tests & SQLite integration tests (8.0)	12m 20s
Solr integration tests (8.0)	16m 39s
Run code style check (8.0)	3m 11s
Unit tests & SQLite integration tests (8.1)	12m 6s
Solr integration tests (8.1)	15m 18s
MySQL integration tests (7.4)	18m 22s
PostgreSQL integration tests (7.4)	40m 30s
MySQL integration tests (8.0)	22m 26s
PostgreSQL integration tests (8.0)	24m 11s
MySQL integration tests (8.1)	17m 59s
PostgreSQL integration tests (8.1)	25m 8s
	3h 52m 27s

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