massren: GO111MODULE=auto for go1.16

[vvvvv]

epic #47627

Fixed building for now and opened an issue laurent22/massren#44

• Have you followed the guidelines for contributing?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install <formula>)?

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[carlocab]

Thanks, @vvvvv.

[carlocab]

Thanks, @vvvvv.