v3.8.4: Update SDK and JDK versions

This commit updates the project to target SDK 36 and use JDK 17.

Specifically, the following changes were made:
- `jitpack.yml` was updated to use `openjdk17` instead of `openjdk8`.
- `pkglib/build.gradle` was updated to:
    - Set `compileSdk` and `targetSdkVersion` to 36.
    - Explicitly set Java compatibility to version 17 in `compileOptions`.

3.8.4.1: feat: update OpenIM SDK AAR

This commit updates the OpenIM SDK AAR file from `open_im_sdk.aar` to `open_im_sdk_update.aar` in the `im-core` module.