Reduce CPU usage on access to java.util.HashTable

[plokhotnyuk]

Fixing of overlooked capacity sizing. Below are results of benchmarks for real-world messages on JDK 17.

Before

[info] Benchmark                                  (size)   Mode  Cnt         Score         Error  Units
[info] GoogleMapsAPIReading.smithy4sJson             N/A  thrpt    5     15125.336 ±      34.299  ops/s
[info] OpenRTBReading.smithy4sJson                   N/A  thrpt    5    177589.601 ±    2958.052  ops/s
[info] TwitterAPIReading.smithy4sJson                N/A  thrpt    5     34670.625 ±    1334.928  ops/s

[info] Benchmark                                  (size)   Mode  Cnt         Score         Error  Units
[info] GoogleMapsAPIReading.smithy4sJson             N/A  thrpt    5     16034.257 ±      40.094  ops/s
[info] OpenRTBReading.smithy4sJson                   N/A  thrpt    5    183281.757 ±    7169.430  ops/s
[info] TwitterAPIReading.smithy4sJson                N/A  thrpt    5     36217.351 ±     284.032  ops/s