Update AVD on CI

[bekuno]

currently:

> Task :main:connectedBasicDebugAndroidTest
Starting 500 tests on android-23(AVD) - 6.0

I suggest to upgrade the test AVD on CI to Version 28 /Android 9.
@Lineflyer Is this today the mostly used version of c:geo?

[Lineflyer]

Version	Percentage	Devices
Android 1.5	0,00%	15
Android 2.2	0,00%	11
Android 2.3.3 - 2.3.7	0,01%	48
Android 3.1	0,00%	4
Android 3.2	0,00%	11
Android 4.0.3 - 4.0.4	0,02%	160
Android 4.1	0,30%	2559
Android 4.2	0,34%	2863
Android 4.3	0,17%	1451
Android 4.4	1,66%	14055
Android 5.0	1,22%	10358
Android 5.1	1,57%	13282
Android 6.0	5,29%	44881
Android 7.0	7,18%	60855
Android 7.1	2,88%	24436
Android 8.0	12,96%	109811
Android 8.1	3,99%	33829
Android 9	30,02%	254419
Android 10	32,39%	274566
No info	0,00%	6
Total	100,00%	847620

[Lineflyer]

I suggest Android 9 although Android 10 is slightly in front.