build(isthmus-cli): use GraalVM 25

[bestbeforetoday]

Benefits from Java 25 performance optimizations.

Closes #218

[nielspardon]

Also resolves an issue where SLF4J log statements were output by the CLI command since the JDK 1.4 logging implementation was specified as a runtime dependency.

This makes me wonder what the behavior should be. Should the CLI have a --debug or --verbose flag to control whether and which log messages should be printed instead of dropping them?

[bestbeforetoday]

This makes me wonder what the behavior should be. Should the CLI have a --debug or --verbose flag to control whether and which log messages should be printed instead of dropping them?

It seems to me pretty unusual for a CLI command to output logging information to the console by default. I could revert it to behave that way again while we think about it, or we could merge this as-is and think about it. Removing the console logging made it slightly easier for me to diff output before and after the GraalVM version change to ensure behaviour was the same. The logging behaviour is separate to the use of the latest GraalVM so just let me know what you prefer either way.

[nielspardon]

It seems to me pretty unusual for a CLI command to output logging information to the console by default.

I think it depends on what CLI commands you take into consideration. If you think of something like grep or jq then it is unusual. If you think of mvn, gradle then it is not so unusual to get log messages printed to the stdout. It feels to me that the logging behavior for the CLI could probably be improved though it feels to me like that is a separate concern from updating the Graal version and maybe should be handled in a separate PR. I do understand why it was useful for your validation of the Graal version update. I'm not sure whether the change as-is with dropping all log messages is what in general we want the CLI behavior to be or whether it should be more configurable via various flags.

[bestbeforetoday]

@nielspardon I have removed the logging change.

[nielspardon]

LGTM