Update Ant CI workflow

Many of the actions used here have been deprecated
(special note to upload-artifact@v2), so update everything to
their newest versions.

Also, add all jars to the artifact zip, not only the base freej2me.jar

.github/workflows/ant.yml

@@ -8,17 +8,18 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
+    - uses: actions/checkout@v4
+    - name: Set up OpenJDK 1.8
+      uses: actions/setup-java@v2
       with:
-        java-version: 1.8
+        distribution: 'adopt'
+        java-version: '8'
     - name: Build with Ant
       run: ant -noinput -buildfile build.xml
     - name: Compute commit short SHA
       id: shortsha
-      run: echo "::set-output name=value::$(git rev-parse --short HEAD)"
-    - uses: actions/upload-artifact@v2
+      run: echo "{name}={value}" >> $GITHUB_OUTPUT
+    - uses: actions/upload-artifact@v4
       with:
         name: freej2me-${{ steps.shortsha.outputs.value }}
-        path: build/freej2me.jar
+        path: build/*.jar