refactor(versioning/loose): Strict null checks (#13454)

* refactor(versioning/loose): Strict null checks

* Fix

* Fix make it boolean

* Get rid of code smell

* Simplify conditions

* Elaborate tests

* Fix

* Update lib/versioning/loose/utils.spec.ts

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

* Update lib/versioning/loose/utils.spec.ts

Co-authored-by: Rhys Arkins <rhys@arkins.net>
Co-authored-by: Michael Kriese <michael.kriese@visualon.de>