Fix `epoch_conflict_confirm` test #2422

Job	Run time
Linux [UBSAN] [lmdb \| clang]	41m 6s
Linux [ASAN] [lmdb \| clang]	37m 56s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	39m 29s
Linux [TSAN] [lmdb \| clang]	39m 58s
macOS [UBSAN] [lmdb \| clang]	31m 2s
Linux [LEAK] [lmdb \| clang]	38m 35s
macOS [ASAN] [lmdb \| clang]	29m 40s
Linux [UBSAN] [rocksdb \| clang]	50m 7s
macOS [TSAN] [lmdb \| clang]	31m 40s
Linux [ASAN] [rocksdb \| clang]	54m 49s
macOS [UBSAN] [rocksdb \| clang]	39m 37s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	53m 14s
macOS [ASAN] [rocksdb \| clang]	39m 17s
Linux [LEAK] [rocksdb \| clang]	54m 22s
macOS [TSAN] [rocksdb \| clang]	49m 15s
	10h 30m 7s

Provide feedback