Fix: the app crashes when running on an Android emulator with API 28 or 30 (but not 29)

[andreaforni]

The app crashes when it runs Android emulator (yarn android) with API version 28 or 30 (but it works fine with 29).
The app crashes without any message in the Metro console. If you check the emulator's logs (using adb logcat brief), you get:

System.err: java.lang.UnsatisfiedLinkError: dlopen failed: "/data/data/io.lfph.covidgreen/lib-main/libc++_shared.so" has unexpected e_machine: 40 (EM_ARM)

There is a ticket open in Facebook's SoLoader project, about that: facebook/SoLoader#59

Comments suggest upgrading React Native to 0.63 (we are now using 0.62.2) or the SoLoader library only to 0.8.1.