Update GitHub actions workflow for Java 21

Author: ERSUCC

.github/workflows/main.yml

@@ -9,16 +9,17 @@ jobs:
   build-and-test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
-      - uses: actions/setup-java@v3
+      - uses: actions/setup-java@v5
         with:
-          distribution: 'liberica'
-          java-version: '17.0'
+          distribution: zulu
+          java-version: 21.0.2
           java-package: jdk+fx
+          cache: sbt
 
       - uses: sbt/setup-sbt@v1
-          
+
       - name: Clone Models
         run: |
           cd ..

project/build.properties

@@ -1 +1 @@
-sbt.version=1.9.7
+sbt.version=1.10.1