fix: make updateZKPRequest in ZKPVerifierBase private

[coveralls]

Pull Request Test Coverage Report for Build 11816788066

Details

• 3 of 3 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 83.204%

---

Totals
Change from base Build 11797994729:	0.0%
Covered Lines:	991
Relevant Lines:	1123

---

💛 - Coveralls