Set Go 1.16.2 for project

What does this MR do?

This MR:

• Sets .tool-versions file to Go 1.16.2, which is the latest point release (https://golang.org/doc/devel/release.html#go1.16.minor) of the version minor release to support Apple Silicon natively: https://golang.org/doc/go1.16#darwin.
• Adds tests for Go 1.16.
• Commits the changes after a make deps-check.

TODO

• Added the Changelog (e.g. Changelog: feature) trailer to the commits that need to be included in the changelog
• Added unit tests (if required)
• Added acceptance tests (if required)
• Documentation (if required)
• Code review guidelines
• Go Style guidelines