Fix `epoch_conflict_confirm` test #2425

Job	Run time
Linux [UBSAN] [lmdb \| clang]	38m 0s
Linux [ASAN] [lmdb \| clang]	38m 54s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	38m 40s
macOS [UBSAN] [lmdb \| clang]	36m 53s
Linux [TSAN] [lmdb \| clang]	39m 47s
macOS [ASAN] [lmdb \| clang]	31m 34s
Linux [LEAK] [lmdb \| clang]	38m 49s
macOS [TSAN] [lmdb \| clang]	33m 59s
Linux [UBSAN] [rocksdb \| clang]	47m 27s
macOS [UBSAN] [rocksdb \| clang]	45m 26s
Linux [ASAN] [rocksdb \| clang]	54m 31s
macOS [ASAN] [rocksdb \| clang]	44m 12s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	55m 32s
macOS [TSAN] [rocksdb \| clang]	54m 59s
Linux [LEAK] [rocksdb \| clang]	51m 58s
	10h 50m 41s

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