Problem: go 1.20.2 is not used

[yihuang]

Solution:

• update nixpkgs to recent master
• re-enable coverage report for integration tests

👮🏻👮🏻👮🏻 !!!! REFERENCE THE PROBLEM YOUR ARE SOLVING IN THE PR TITLE AND DESCRIBE YOUR SOLUTION HERE !!!! DO NOT FORGET !!!! 👮🏻👮🏻👮🏻

PR Checklist:

• Have you read the CONTRIBUTING.md?
• Does your PR follow the C4 patch requirements?
• Have you rebased your work on top of the latest master?
• Have you checked your code compiles? (make)
• Have you included tests for any non-trivial functionality?
• Have you checked your code passes the unit tests? (make test)
• Have you checked your code formatting is correct? (go fmt)
• Have you checked your basic code style is fine? (golangci-lint run)
• If you added any dependencies, have you checked they do not contain any known vulnerabilities? (go list -json -m all | nancy sleuth)
• If your changes affect the client infrastructure, have you run the integration test?
• If your changes affect public APIs, does your PR follow the C4 evolution of public contracts?
• If your code changes public APIs, have you incremented the crate version numbers and documented your changes in the CHANGELOG.md?
• If you are contributing for the first time, please read the agreement in CONTRIBUTING.md now and add a comment to this pull request stating that your PR is in accordance with the Developer's Certificate of Origin.

Thank you for your code, it's appreciated! :)

[codecov]

Codecov Report

Merging #926 (580b74b) into main (2a8e2d4) will decrease coverage by 15.23%.
The diff coverage is n/a.

❗ Current head 580b74b differs from pull request most recent head 70e939d. Consider uploading reports for the commit 70e939d to get more accurate results

@@             Coverage Diff             @@
##             main     #926       +/-   ##
===========================================
- Coverage   36.78%   21.56%   -15.23%     
===========================================
  Files          57       48        -9     
  Lines        4170     2991     -1179     
===========================================
- Hits         1534      645      -889     
+ Misses       2460     2285      -175     
+ Partials      176       61      -115     

see 62 files with indirect coverage changes