refactor: upgrade Go to 1.16

Artyom Kartasovrequested to merge
upgrade-go-1-6 into master

Description

Upgrade Go to 1.16:

  • change default build images
  • handle deprecation of io/ioutils

Checklist

  • the MR description has been reviewed
  • this MR contains text changes and they have been reviewed OR there are no texts changes
  • this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
  • this MR contains API changes, specifications reflect those changes and they have been reviewed OR there are no API changes
Edited by Artyom Kartasov

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