Increase targetSdkVersion from 30 to 34 to meet Play Store requirements

[ssb22]

Hi, thanks for writing this app. Currently, android/app/build.gradle contains targetSdkVersion 30 which is Android 11. For the last couple of years, the Play Store has hidden apps that target old versions of Android if you are using it on a newer version of Android. So for example if you were currently looking to install deedum on an Android 14 phone, you wouldn't be able to find it on the Play Store (even if it were there) unless that targetSdkVersion were increased to 34. (There shouldn't be anything in this app that significantly changes its behaviour on Android 14 vs Android 11, so it should be sufficient just to set targetSdkVersion to 34 and have users test it.)

However an additional problem seems to be that this app has been removed from the Play Store altogether, even for older versions of Android (I was unable to find it in Play Store on an old Android 10 phone). I'm not sure why that would have happened. The APK download is still available from F-Droid (works for me on Android 14) for those of us who are not constrained by carriers etc to using Google Play only.