fix(deps): update dependency com.android.tools.build:gradle to v3.6.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.android.tools.build:gradle (source)	3.5.3 -> 3.6.4

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[codecov]

Codecov Report

Merging #121 (e9d2687) into master (1aabe4d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #121   +/-   ##
=======================================
  Coverage   99.84%   99.84%           
=======================================
  Files          19       19           
  Lines         627      627           
  Branches       62       62           
=======================================
  Hits          626      626           
  Misses          1        1           

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