update compiler veresion to 21

Author: zhongkechen

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -53,7 +53,6 @@ body:
       label: Java Version
       description: What version of Java are you using?
       options:
-        - "17"
         - "21"
         - "25"
         - Other (specify in additional context)

pom.xml

@@ -46,8 +46,8 @@
     </modules>
 
     <properties>
-        <maven.compiler.source>25</maven.compiler.source>
-        <maven.compiler.target>25</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <aws.sdk.version>2.42.8</aws.sdk.version>
         <jackson.version>2.21.1</jackson.version>