update java comiler version to 17

Author: Chanaka Balasooriya

pom.xml

@@ -59,8 +59,8 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>21</maven.compiler.source>
-        <maven.compiler.target>21</maven.compiler.target>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
         <spring.version>6.2.0</spring.version>
         <postgresql.version>42.7.4</postgresql.version>
     </properties>