chore!: set base Java version to 21 (#490)

Author: mcollovati

pom.xml

@@ -40,8 +40,9 @@
     <properties>
 
         <encoding>UTF-8</encoding>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.release>21</maven.compiler.release>
+        <maven.compiler.source>${maven.compiler.release}</maven.compiler.source>
+        <maven.compiler.target>${maven.compiler.release}</maven.compiler.target>
         <maven.surefire.plugin.version>3.5.3</maven.surefire.plugin.version>
         <maven.javadoc.version>3.11.2</maven.javadoc.version>
         <driver.binary.downloader.maven.plugin.version>1.0.18</driver.binary.downloader.maven.plugin.version>