This commit fixes 2 issues:
- service.sh of files were not being executed in parallel, a behavior described in: https://github.com/topjohnwu/Magisk/blob/master/docs/guides.md#boot-scripts . This was fixed by using "&" in the end of the command to execute the module's service.sh, telling the shell to not block.
- Gradle wrapper used in ReZygisk was old, causing failing CIs.
It also updates the NDK version to ensure we'll be operating smoothly.