Add workaround for checkboxes to ValueConflictValidator #815

Job	Run time
Lint	15s
Test installation of all dependencies	1m 12s
Test dev setup on ubuntu-latest	26s
Test dev setup on windows-latest	1m 47s
Test dev setup on macos-latest	22s
Test (Python: 3.8, DB: mysql)	25m 3s
Test (Python: 3.8, DB: postgres)	24m 35s
Test (Python: 3.12, DB: mysql)	28m 19s
Test (Python: 3.12, DB: postgres)	32m 10s
Indicate completion to coveralls	4s
Build python wheel	1m 36s
required-checks-pass	4s
	1h 55m 53s

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