Fix key type when deserializing map objects

[jnd77]

Fix typo about key type

[CLAassistant]

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[github-actions]

Benchmark                                 (client)  (connection)  (statement)  (type)   Mode  Cnt     Score     Error  Units
Basic.insertOneRandomNumber  clickhouse-http-jdbc1         reuse       normal  object  thrpt   20   219.079 ±  23.919  ops/s
Basic.insertOneRandomNumber  clickhouse-http-jdbc1         reuse     prepared  object  thrpt   20   234.956 ±  36.461  ops/s
Basic.insertOneRandomNumber  clickhouse-http-jdbc1           new       normal  object  thrpt   20   215.840 ±  28.584  ops/s
Basic.insertOneRandomNumber  clickhouse-http-jdbc1           new     prepared  object  thrpt   20   231.190 ±  30.151  ops/s
Basic.insertOneRandomNumber   clickhouse-grpc-jdbc         reuse       normal  object  thrpt   20   231.710 ±  31.152  ops/s
Basic.insertOneRandomNumber   clickhouse-grpc-jdbc           new       normal  object  thrpt   20   232.150 ±  26.036  ops/s
Basic.selectOneRandomNumber  clickhouse-http-jdbc1         reuse       normal  object  thrpt   20  1590.295 ±  96.181  ops/s
Basic.selectOneRandomNumber  clickhouse-http-jdbc1         reuse     prepared  object  thrpt   20  1661.114 ±  78.054  ops/s
Basic.selectOneRandomNumber  clickhouse-http-jdbc1           new       normal  object  thrpt   20  1414.232 ± 227.632  ops/s
Basic.selectOneRandomNumber  clickhouse-http-jdbc1           new     prepared  object  thrpt   20  1688.162 ±  74.917  ops/s
Basic.selectOneRandomNumber   clickhouse-grpc-jdbc         reuse       normal  object  thrpt   20  1023.433 ±  88.408  ops/s
Basic.selectOneRandomNumber   clickhouse-grpc-jdbc         reuse     prepared  object  thrpt   20  1000.395 ± 124.100  ops/s
Basic.selectOneRandomNumber   clickhouse-grpc-jdbc           new       normal  object  thrpt   20   985.291 ± 102.074  ops/s
Basic.selectOneRandomNumber   clickhouse-grpc-jdbc           new     prepared  object  thrpt   20   963.086 ± 108.879  ops/s

[zhicwu]

Good catch @jnd77 :) Merge as the build failures are irrelevant. I'll add tests for regression and fix build break in a separate PR.