CI Update to use Android 31 image for espresso tests

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[codecov[bot]]

Codecov Report

Merging #1205 (ce62f29) into master (0b739fc) will decrease coverage by 11.13%. The diff coverage is n/a.

@@              Coverage Diff              @@
##             master    #1205       +/-   ##
=============================================
- Coverage     45.25%   34.12%   -11.14%     
+ Complexity     1001      800      -201     
=============================================
  Files           172      170        -2     
  Lines          6722     6679       -43     
  Branches        689      685        -4     
=============================================
- Hits           3042     2279      -763     
- Misses         3297     4099      +802     
+ Partials        383      301       -82     

Flag	Coverage Δ
uitests	26.96% <ø> (-13.21%)	:arrow_down:
unittests	14.16% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...rg/owntracks/android/ui/welcome/WelcomeFragment.kt	0.00% <0.00%> (-100.00%)	:arrow_down:
...owntracks/android/location/NoopGeofencingClient.kt	0.00% <0.00%> (-100.00%)	:arrow_down:
...tion/dialog/ConnectionHostHttpDialogViewModel.java	0.00% <0.00%> (-90.91%)	:arrow_down:
...g/owntracks/android/ui/contacts/ContactsAdapter.kt	0.00% <0.00%> (-90.63%)	:arrow_down:
...org/owntracks/android/ui/welcome/WelcomeAdapter.kt	0.00% <0.00%> (-85.72%)	:arrow_down:
...tion/dialog/ConnectionIdentificationViewModel.java	0.00% <0.00%> (-84.85%)	:arrow_down:
.../owntracks/android/support/widgets/TextDrawable.kt	0.00% <0.00%> (-81.58%)	:arrow_down:
...ui/preferences/connection/ConnectionViewModel.java	0.00% <0.00%> (-77.42%)	:arrow_down:
...org/owntracks/android/ui/map/osm/OSMMapFragment.kt	0.00% <0.00%> (-77.06%)	:arrow_down:
...g/owntracks/android/ui/welcome/WelcomeViewModel.kt	0.00% <0.00%> (-69.24%)	:arrow_down:
... and 37 more

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