fix(ci): nim 2.0 dependency failure

[AlejandroCabeza]

Broken due to an update to Nimble 0.16.2 for the version-2-0 branch. This PR sets the ref to the previous commit. Also, updates the key naming so it fits better.

Nim's commit list: https://github.com/nim-lang/Nim/commits/version-2-0/

Important Note

In this PR some required job's names were changed. They need to be updated at repo-level so this PR can be merged.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.51%. Comparing base (09fe199) to head (ba783f3).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1216      +/-   ##
==========================================
- Coverage   84.54%   84.51%   -0.03%     
==========================================
  Files          93       93              
  Lines       16650    16685      +35     
==========================================
+ Hits        14076    14101      +25     
- Misses       2574     2584      +10     

see 5 files with indirect coverage changes

[kaiserd]

Thank you. This is a temp fix until we solve nim-lang/nimble#1277 solved.

[kaiserd]

(finalizing this in a meeting)