fix: upgrade jandex to 3.2.3 to handle modern class files

[maxandersen]

What

Running a jar built with a recent JDK, e.g. jbang com.netflix:com.netflix.tools.jfmt:0.8.2, crashed with:

[jbang] [ERROR] Index 0 out of bounds for length 0
java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
	at org.jboss.jandex.Indexer.updateTypeTarget(Indexer.java:903)

Why

The jar has no Main-Class manifest, so jbang scans its classes with jandex to find main() methods. The bundled org.jboss:jandex:2.2.3.Final (2021) cannot parse Java 25 class files (major 69) and throws. Only IOException was caught, so the crash surfaced as the cryptic error above.

Fix

• Switch org.jboss:jandex:2.2.3.Final → io.smallrye:jandex:3.2.3 (same org.jboss.jandex package, targets Java 8 bytecode so no compatibility impact; no code changes needed)
• JarCmdGenerator: skip module-info.class and catch per-entry exceptions so one unparseable class cannot break main class detection (details logged with --verbose)
• Regression test: jar with corrupt class entries now yields the friendly "No main class deduced…" error instead of AIOOBE

Verified jbang com.netflix:com.netflix.tools.jfmt:0.8.2 now runs.

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