Min JDK for current cljs release seems to be 21

Author: lread

script/ci_unit_tests.clj

@@ -23,7 +23,7 @@
                         ;; macOS on GitHub Actions is now arm-based and does not include jdk8
                         "macos"   ["11" "17" "21" "24"]
                         "windows" ["8" "11" "17" "21" "24"]})
-(def ^:private jdk-cljs "11")
+(def ^:private jdk-cljs "21")
 (def ^:private jdk-shadow-cljs "21")
 (def ^:private all-oses (keys os-jdks))