update ergo-lib to v0.23;

[coveralls]

Pull Request Test Coverage Report for Build 4345138712

• 1 of 12 (8.33%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 60.987%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core/src/contracts/update.rs	0	1	0.0%
core/src/contracts/refresh.rs	0	10	0.0%
<!--	Total:	1	12	8.33%	-->

Totals
Change from base Build 4344736167:	0.0%
Covered Lines:	2040
Relevant Lines:	3345

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💛 - Coveralls