Use Java 21 (Temurin 17 unavailable on Windows ARM64)

Author: ochafik

.github/workflows/ci.yml

@@ -47,7 +47,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: "17"
+          java-version: "21"
 
       - run: npm install
 

examples/inlined-server-java/pom.xml

@@ -10,7 +10,7 @@
   <packaging>jar</packaging>
 
   <properties>
-    <java.version>17</java.version>
+    <java.version>21</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>