feature: Support JDK21 (#3189)

.github/workflows/test.yml

@@ -96,22 +96,22 @@ jobs:
           annotate_only: true
           detailed_summary: true
   test_2_13_latest_jdk:
-    name: Scala 2.13 + JDK20
+    name: Scala 2.13 + JDK21
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-java@v3
         with:
-          distribution: 'temurin'
-          java-version: '20'
-      - name: Scala 2.13 + JDK20 test
+          distribution: 'zulu'
+          java-version: '21-ea'
+      - name: Scala 2.13 + JDK21 test
         run: ./sbt ++2.13 projectJVM/test
       - name: Publish Test Report
         uses: mikepenz/action-junit-report@v3
         if: always() # always run even if the previous step fails
         with:
           report_paths: '**/target/test-reports/TEST-*.xml'
-          check_name: Test Report Scala 2.13 + JDK20
+          check_name: Test Report Scala 2.13 + JDK21
           annotate_only: true
           detailed_summary: true
   test_3:

.mergify.yml

@@ -7,7 +7,7 @@ pull_request_rules:
       - check-success=Code format
       - check-success=Scala 2.12
       - check-success=Scala 2.13 + JDK11
-      - check-success=Scala 2.13 + JDK20
+      - check-success=Scala 2.13 + JDK21
       - check-success=Scala 3.x (Dotty)
       - check-success=Scala.js / Scala 2.12
       - check-success=Scala.js / Scala 2.13