Update CHANGELOG to release v10.0

Bump up image version to v9.3

Remove variant image (JDK11) - the forgotten part

Update changelog to release v9.1

Fix gcloud cli installation

Prepare new release (v8.0)

Prepare new release (v7.2)

Prepare new release (v7.1)

Prepare new release (v7.0)

Bump up Android SDK, Gradle and Kotlin compiler