chore(ci): specify Android API level as number

[bakoushin]

Description

Follow up to #6031

The Android API level must be specified not as a string but as a number, as is expected in e2e-android.yml

Test plan

CI works

Related issues

• Related to RET-1194

Backwards compatibility

NA

Network scalability

NA

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.03%. Comparing base (c6e2357) to head (47fa6af).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6368   +/-   ##
=======================================
  Coverage   89.02%   89.03%           
=======================================
  Files         735      735           
  Lines       31327    31327           
  Branches     5506     5506           
=======================================
+ Hits        27889    27892    +3     
+ Misses       3393     3390    -3     
  Partials       45       45           

see 1 file with indirect coverage changes

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[jeanregisser]

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