revert plans for a deeper version

Author: steveloughran

parquet-benchmarks/src/main/java/org/apache/parquet/benchmarks/VariantBenchmark.java

@@ -97,8 +97,6 @@ public enum Depth {
     Flat,
     /** Nested values. */
     Nested,
-    /** Deeper nesting structure. */
-    DeepNesting;
   }
 
   /**
@@ -112,7 +110,7 @@ public enum Depth {
   private int fieldCount;
 
   /** Whether to include nested variant objects as some of the field values. */
-  @Param({"Flat", "Nested", "DeepNesting"})
+  @Param({"Flat", "Nested"})
   private Depth depth;
 
   /**