chore: Bump GitHub workflow actions/checkout to latest released version v6

[deining]

This PR bumps GitHub workflow actions/checkout to latest released version v6.

[coveralls]

Pull Request Test Coverage Report for Build 19551617250

Details

• 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 19.183%

---

Totals
Change from base Build 19483259017:	0.0%
Covered Lines:	535
Relevant Lines:	2789

---

💛 - Coveralls