AUR package: remove gradle dependency usage

[cmrd-senya]

Arch Linux updated Gradle to version 7 and crowdin-cli doesn't build with this version yet (fails with an error).

Looks like we can just call gradlew script instead of a 3rd party provided Gradle installation, which will pull the right version of Gradle for the project.

P.S. I've already pushed this changed to AUR

[codecov]

Codecov Report

Merging #359 (af43533) into cli3 (5725164) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               cli3     #359   +/-   ##
=========================================
  Coverage     58.49%   58.49%           
  Complexity      856      856           
=========================================
  Files           143      143           
  Lines          4148     4148           
  Branches        590      590           
=========================================
  Hits           2426     2426           
  Misses         1434     1434           
  Partials        288      288           

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[andrii-bodnar]

@cmrd-senya thanks a lot for your contribution! 🎉

I could not understand the reason for today's CI error in the package publication, even created an issue in the github-actions-deploy-aur repo 😄

Now everything is clear, thank you!