support com.aerospike:aerospike-client-jdk21 (for using virtual threads)

[KimSoungRyoul]

support com.aerospike:aerospike-client-jdk21

https://github.com/aerospike/spring-data-aerospike/blob/main/pom.xml#L33

<!-- https://github.com/aerospike/spring-data-aerospike/blob/main/pom.xml#L33  -->
   <properties>
        <java.version>21</java.version>
        <!--<java.version>17</java.version> -->
        <maven.compiler.source>${java.version}</maven.compiler.source>
        <maven.compiler.target>${java.version}</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <springdata.commons>3.4.0</springdata.commons>
        <spring-boot-starter-test>3.3.0</spring-boot-starter-test>
        <spring-cloud-starter-bootstrap>4.1.5</spring-cloud-starter-bootstrap>
        <spring-tx>6.2.0</spring-tx>
        <maven.javadoc.plugin>3.3.0</maven.javadoc.plugin>
        <maven.gpg.plugin>1.6</maven.gpg.plugin>
       <!--<aerospike-client-jdk8>9.0.2</aerospike-client-jdk8> -->
        <aerospike-client-jdk21>9.0.2</aerospike-client-jdk21>
   </properties>

[reugn]

Spring Boot currently requires Java 17 as a minimum. Upgrading the Aerospike Java client to a jdk21 version would break this compatibility. We plan to adopt the jdk21 client once Spring Boot no longer supports Java 17. Did your performance tests indicate a significant improvement between the jdk8 and jdk21 Aerospike clients?