Use single version for strictly in mockito-android

[kozaxinan]

check list

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Fixes #2007

In #2024, code review suggested to use strictly '[2.6, 3.1[' instead if strictly '2.6'. Comment
Apparently I failed to test that suggestion and it broke the fix in #2007.

Using strictly '2.6' works as expected. It fails the objenesis resolution and suggest to exclude mockito-core from mockito-kotlin.

[codecov-commenter]

Codecov Report

Merging #2053 into release/3.x will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             release/3.x    #2053   +/-   ##
==============================================
  Coverage          84.90%   84.90%           
  Complexity          2704     2704           
==============================================
  Files                325      325           
  Lines               8206     8206           
  Branches             979      979           
==============================================
  Hits                6967     6967           
  Misses               968      968           
  Partials             271      271           

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[TimvdLippe]

Thanks unfortunate, but understood why it doesn't work. Thanks for verifying and fixing!