Can upgrade this to 31 for V9

[luoyexk]

mapbox-android-demo/gradle/dependencies.gradle

Line 5 in 8550db8

targetSdkVersion : 29,

Meet Google Play's target API level requirement

When you upload an APK, it must meet Google Play’s target API level requirements.

New apps must target Android 12 (API level 31) or higher; except for Wear OS apps, which must target Android 11 (API level 30) or higher.

Starting in November 2022, app updates must target API level 31 or above and adjust for behavioral changes in Android 12; except for Wear OS apps, which must target API level 30 or higher.

Note: Starting in 2022, some out-of-date apps will be unavailable to new users of devices that run newer versions of Android.