you need to change api level to 29 in buildozer.spec file
# (int) Target Android API, should be as high as possible.
android.api = 29
# (int) Minimum API your APK will support.
android.minapi = 21
# (int) Android SDK version to use
android.sdk = 29
# (str) Android NDK version to use
#android.ndk = 19b
# (int) Android NDK API to use. This is the minimum API your app will support, it should usually match android.minapi.
android.ndk_api = 21
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