Update prometheus/client_golang to v1.19.0, revert go.mod back to 1.20

[coveralls]

Pull Request Test Coverage Report for Build 304

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 84.231%

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Totals
Change from base Build 296:	0.0%
Covered Lines:	1971
Relevant Lines:	2340

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💛 - Coveralls

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 80.60%. Comparing base (ce9bffb) to head (8e2ba7e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #887 +/- ## ======================================= Coverage 80.60% 80.60% ======================================= Files 17 17 Lines 2331 2331 ======================================= Hits 1879 1879 Misses 369 369 Partials 83 83 ```

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