Fix lock hash type (#14379)

Author: nikvas0

ydb/core/kqp/compute_actor/kqp_scan_compute_actor.h

@@ -27,7 +27,7 @@ class TKqpScanComputeActor: public TSchedulableComputeActorBase<TKqpScanComputeA
     NMiniKQL::TKqpScanComputeContext::TScanData* ScanData = nullptr;
 
     struct TLockHash {
-        bool operator()(const NKikimrDataEvents::TLock& lock) {
+        size_t operator()(const NKikimrDataEvents::TLock& lock) {
             return MultiHash(
                 lock.GetLockId(),
                 lock.GetDataShard(),