Replace jcenter with mavenCentral in build.gradle

[nilsreichardt]

Description

jcenter is deprecated. This is the reason why an Android build could fail with this error message:

* What went wrong:
Could not determine the dependencies of task ':app:minifyProdReleaseWithR8'.
> Could not resolve all dependencies for configuration ':app:prodReleaseRuntimeClasspath'.
   > Could not determine artifacts for com.google.android.exoplayer:exoplayer-hls:2.12.1
      > Could not get resource 'https://jcenter.bintray.com/com/google/android/exoplayer/exoplayer-hls/2.12.1/exoplayer-hls-2.12.1.aar'.
         > Could not HEAD 'https://jcenter.bintray.com/com/google/android/exoplayer/exoplayer-hls/2.12.1/exoplayer-hls-2.12.1.aar'.
            > Connect to jcenter.bintray.com:443 [jcenter.bintray.com/34.95.74.180] failed: connect timed out

For testing, I used the Codemagic Linux Premium VMs because with these was the issue reproducible.

I replaced jcenter with mavenCentral and the builds on the Linux Premium VMs are working again. Builds on my M1 MacBook Pro also working 👍

[Jonas-Sander]

LGTM

[github-actions]

Visit the preview URL for this PR (updated for commit e64a750):

https://sharezone-test--pr228-replace-jcenter-lati6764.web.app

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