CI: move Ubuntu workflows to JDK 21 (#323)

* chore: upgrade Apache NetBeans dependency to RELEASE300

Agent-Logs-Url: https://github.com/jeddict/jeddict-ai/sessions/6f9ec6eb-6f0c-4aaf-bc2d-d927091c2fdf

Co-authored-by: jGauravGupta <15934072+jGauravGupta@users.noreply.github.com>

* ci: use JDK 21 in GitHub Actions workflows

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jGauravGupta <15934072+jGauravGupta@users.noreply.github.com>

Author: Copilot

.github/workflows/maven.yml

@@ -25,10 +25,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v4
       with:
-        java-version: '17'
+        java-version: '21'
         distribution: 'temurin'
         cache: maven
     - name: Build with Maven
@@ -44,10 +44,10 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v4
       with:
-        java-version: '17'
+        java-version: '21'
         distribution: 'temurin'
 
     - name: Set up GPG for signing

pom.xml

@@ -46,7 +46,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.release>17</maven.compiler.release>
         <langchain4j.version>1.11.0</langchain4j.version>
-        <netbeans.version>RELEASE290</netbeans.version>
+        <netbeans.version>RELEASE300</netbeans.version>
     </properties>
 
     <build>