Bump jdk to 21 in ci (#874)

Author: jdneo

.github/workflows/linux.yml

@@ -21,10 +21,10 @@ jobs:
         sudo /usr/bin/Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
         sleep 3
 
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v1
       with:
-        java-version: '17'
+        java-version: '21'
 
     - name: Setup Node.js environment
       uses: actions/setup-node@v2

.github/workflows/linuxUI.yml

@@ -21,10 +21,10 @@ jobs:
         sudo /usr/bin/Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
         sleep 3
 
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v1
       with:
-        java-version: '17'
+        java-version: '21'
 
     - name: Setup Node.js environment
       uses: actions/setup-node@v2

.github/workflows/macOS.yml

@@ -14,10 +14,10 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v1
       with:
-        java-version: '17'
+        java-version: '21'
 
     - name: Setup Node.js environment
       uses: actions/setup-node@v2

.github/workflows/windows.yml

@@ -14,10 +14,10 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v1
       with:
-        java-version: '17'
+        java-version: '21'
 
     - name: Setup Node.js environment
       uses: actions/setup-node@v2

.github/workflows/windowsUI.yml

@@ -14,10 +14,10 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v1
       with:
-        java-version: '17'
+        java-version: '21'
 
     - name: Setup Node.js environment
       uses: actions/setup-node@v2

jdtls.ext/com.microsoft.jdtls.ext.target/com.microsoft.jdtls.ext.tp.target

@@ -10,20 +10,16 @@
             <unit id="org.eclipse.equinox.sdk.feature.group" version="0.0.0"/>
             <unit id="org.eclipse.jdt.source.feature.group" version="0.0.0"/>
             <unit id="org.eclipse.sdk.feature.group" version="0.0.0"/>
-            <repository location="https://download.eclipse.org/eclipse/updates/4.31/"/>
+            <repository location="https://download.eclipse.org/eclipse/updates/4.35/"/>
         </location>
         <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">
             <unit id="org.eclipse.xtext.xbase.lib" version="0.0.0"/>
-            <repository location="https://download.eclipse.org/releases/2024-03/"/>
+            <repository location="https://download.eclipse.org/releases/2024-12/"/>
         </location>
         <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">
             <unit id="org.eclipse.jdt.ls.core" version="0.0.0"/>
             <repository location="https://download.eclipse.org/jdtls/snapshots/repository/latest/"/>
         </location>
-        <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">
-           <repository location="https://download.eclipse.org/lsp4j/updates/releases/0.23.1/"/>
-           <unit id="org.eclipse.lsp4j" version="0.0.0"/>
-        </location>
         <location includeDependencyDepth="none" includeDependencyScopes="compile" includeSource="true" missingManifest="generate" type="Maven">
             <dependencies>
                 <dependency>