adjusted read me

Author: Vadym Kazulkin

spring-boot-3.4-with-aws-serverless-java-container-as-graalvm-native-image/README.md

@@ -5,7 +5,7 @@
 
  source "/home/ec2-user/.sdkman/bin/sdkman-init.sh"
 
-3) Install GraalVM 21 (https://www.graalvm.org/latest/docs/getting-started/linux/)
+3) Install GraalVM (https://www.graalvm.org/latest/docs/getting-started/linux/)
  sdk install java 23.0.1-graal
 
 4) Install Native Image (https://www.graalvm.org/latest/reference-manual/native-image/)