Fix ValueConflictValidator #316

Job	Run time
Lint	40s
Test installation of all dependencies	1m 16s
Test dev setup on ubuntu-latest	27s
Test dev setup on windows-latest	1m 14s
Test dev setup on macos-latest	45s
Test (Python: 3.8, DB: mysql)	23m 35s
Test (Python: 3.8, DB: postgres)	22m 56s
Test (Python: 3.12, DB: mysql)	29m 18s
Test (Python: 3.12, DB: postgres)	32m 44s
Build python wheel	1m 10s
Indicate completion to coveralls	15s
required-checks-pass	4s
	1h 54m 24s

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