Update GraalVM detection in Platform Detector (#1286)

How the GraalVM reports itself in the vendor and vm flags has evolved in
newer version.  Report GraalVM if it is seen in either string.

Signed-off-by: Danno Ferrin <danno.ferrin@gmail.com>

util/src/main/java/org/hyperledger/besu/util/platform/PlatformDetector.java

@@ -169,7 +169,7 @@ public class PlatformDetector {
   }
 
   static String normalizeVM(final String javaVendor, final String javaVmName) {
-    if (javaVmName.contains("graalvm")) {
+    if (javaVmName.contains("graalvm") || javaVendor.contains("graalvm")) {
       return "graalvm";
     }
     if (javaVendor.contains("oracle")) {