fix: gen_version job missing checkout action

[iwpnd]

The gen_version job is missing the code checkout. Therefor getting the default branch errors out with

fatal: not a git repository (or any of the parent directories): .git

[coveralls]

Pull Request Test Coverage Report for Build e3200c227-PR-827

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 45.202%

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Totals
Change from base Build 97ebfc033:	0.0%
Covered Lines:	5483
Relevant Lines:	12130

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💛 - Coveralls