Use jvmToolchain 21 for JetStream

[gramound]

Android Studio's built-in jbr is based on openjdk 21.0.8

Fix: #192

[gemini-code-assist]

Summary of Changes

Hello @gramound, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the project's build configuration to align with JVM toolchain and target version 21. This change is motivated by Android Studio's built-in Java Runtime Environment (JBR) being based on OpenJDK 21.0.8, ensuring better compatibility and allowing the project to leverage the latest Java features and performance enhancements.

Highlights

• JVM Toolchain Update: The Kotlin JVM toolchain has been updated from version 17 to 21 in both JetStreamCompose/benchmark/build.gradle.kts and JetStreamCompose/jetstream/build.gradle.kts.
• JVM Target Update: The Kotlin JVM target has been updated from version 17 to 21 in JetStreamCompose/jetstream/build.gradle.kts.

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[gemini-code-assist]

Code Review

This pull request updates the JVM toolchain from 17 to 21 across the JetStream project. This is a good change to keep the project aligned with modern development environments like Android Studio. The changes are applied correctly. I have one suggestion for jetstream/build.gradle.kts to remove a redundant kotlinOptions block, as its configuration is now automatically handled by the jvmToolchain setting. This will help improve the build script's clarity and maintainability.

[gemini-code-assist]

The jvmTarget is automatically inferred from the jvmToolchain setting. Since you've set jvmToolchain(21) on line 27, this kotlinOptions block is redundant and can be safely removed. This will make the build script cleaner and less prone to configuration mismatches in the future.

[gramound]

Thanks for the suggestion. I added it as a second commit on the same branch (to be squashed at the end).