fix(dynamodb): drop the two type imports left unused by the cast removal

Dropping the redundant as-casts left ProvisionedThroughput and OnDemandThroughput imported but unreferenced. Caught by CI because the previous round ran vp check --fix but not vp run check, and only the latter is CI parity.

Author: go-to-k

src/provisioning/providers/dynamodb-globaltable-provider.ts

@@ -19,8 +19,6 @@ import {
   type GlobalSecondaryIndex,
   type GlobalSecondaryIndexUpdate,
   type LocalSecondaryIndex,
-  type OnDemandThroughput,
-  type ProvisionedThroughput,
   type ReplicaGlobalSecondaryIndex,
   type StreamSpecification,
   type Tag,