Reduce lower bound interval (#458)

src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum/EthereumLowerBoundBlockDetector.kt

@@ -18,7 +18,7 @@ class EthereumLowerBoundBlockDetector(
     private val recursiveLowerBound = RecursiveLowerBound(upstream, LowerBoundType.BLOCK, setOf("No block data"))
 
     override fun period(): Long {
-        return 5
+        return 3
     }
 
     override fun internalDetectLowerBound(): Flux<LowerBoundData> {

src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum/EthereumLowerBoundStateDetector.kt

@@ -45,7 +45,7 @@ class EthereumLowerBoundStateDetector(
     }
 
     override fun period(): Long {
-        return 5
+        return 3
     }
 
     override fun internalDetectLowerBound(): Flux<LowerBoundData> {