Update to Kotlin 1.9.24 and related build tool versions

[garyp]

Kotlin 1.9.24, which necessitated also updating Gradle, Java, Android Gradle Plugin, etc.

Notable changes resulting from the version bumps:

• Dropped support for the legacy Kotlin/JS compiler.
• Minimum JVM version required for building pbandk is now v17 (pbandk still supports JVM 8+ at runtime).
• The Kotlin/JS compiler changed how it represents Long internally, which required some refactoring of the Kotlin<->JS Long conversion code in runtime/src/jsMain/kotlin/pbandk/protobufjs/Util.kt.
• Various changes to the gradle configs and other build files to support build-time changes introduced in newer Kotlin versions.

[garyp]

LGTM, is the plan to do a release after this is merged?

Yep. I'm going to make a release after this PR and #268 and #269 are merged. The 3 PRs all go together. And then once Kotlin 2.0.10 is out in the near future and #270 is merged I'll make another release. That way there'll be a recent pbandk release with a Kotlin 1.9 dependency for anyone who isn't ready yet to update to Kotlin 2.0.