update deps

[mihaibuzgau]

This PR:

• moves the mage target definitions to ./magefiles folder
• bumps runtime to v0.45.0 that uses OPA version v0.45.0
• First pass of removing the dependency to aserto-dev/go-utils

[coveralls]

Pull Request Test Coverage Report for Build 3330386887

• 12 of 19 (63.16%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 15.179%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/extended_registry/aserto.go	12	19	63.16%
<!--	Total:	12	19	63.16%	-->

Totals
Change from base Build 3329679259:	0.04%
Covered Lines:	512
Relevant Lines:	3373

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💛 - Coveralls