Documentation in readme says its compiled in java 8 when it is actually coded in java 21.

[Crossfire83]

sample-apps/java-basic/README.md file says java 8 compiler is required when the application is coded for java 21 on line 16.

[micheal000010000-hub]

Hi 👋, I’ve opened a pull request that fixes this by updating the Java version requirement in the README to match the build configuration.

PR: #484