use JDK 21 in CI because of sb4 support

davidmoten · davidmoten · commit 35ae4abdf031 · 2025-12-04T09:31:02.000+11:00
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -6,4 +6,4 @@ jobs:
   build:
     uses: davidmoten/workflows/.github/workflows/ci.yml@master
     with:
-        jdk-matrix: '["17","21"]'
+        jdk-matrix: '["21"]'
