Use jdk latest for github espresso style gate

Author: gilles-duboscq

.github/workflows/main.yml

@@ -110,7 +110,8 @@ jobs:
               PRIMARY: "compiler"
           # /espresso
           - env:
-              JDK_VERSION: "21"
+              JDK_VERSION: "latest"
+              TOOLS_JDK_VERSION: "21"
               GATE_TAGS: "style,fullbuild"
               PRIMARY: "espresso"
           # /substratevm