Fix `epoch_conflict_confirm` test #2421

Job	Run time
Linux [UBSAN] [lmdb \| clang]	38m 6s
Linux [ASAN] [lmdb \| clang]	39m 7s
macOS [UBSAN] [lmdb \| clang]	38m 3s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	38m 18s
macOS [ASAN] [lmdb \| clang]	28m 45s
macOS [TSAN] [lmdb \| clang]	31m 49s
Linux [TSAN] [lmdb \| clang]	40m 21s
macOS [UBSAN] [rocksdb \| clang]	40m 26s
Linux [LEAK] [lmdb \| clang]	38m 35s
macOS [ASAN] [rocksdb \| clang]	38m 2s
Linux [UBSAN] [rocksdb \| clang]	46m 52s
macOS [TSAN] [rocksdb \| clang]	50m 20s
Linux [ASAN] [rocksdb \| clang]	52m 19s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	55m 40s
Linux [LEAK] [rocksdb \| clang]	54m 24s
	10h 31m 7s

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