Deprecation warnings in GitHub workflows

[cubeddu]

Issue #156

Updated build_docker.yml and unit.yml to address annotations from deprecation warnings.

This PR addresses issue #156 by updating the build_docker.yml and unit.yml files to use the latest versions of the actions and address annotations from deprecation warnings.

In build_docker.yml, we updated the actions/checkout action to the latest version.

In unit.yml, we updated the actions/setup-node action to version 2 and removed the node-version option, which is now deprecated. We also updated the codecov/codecov-action action to version 3 and removed the directory and files options, which are not necessary for the default configuration.

Links to the updated files:

• .github/workflows/build_docker.yml
• .github/workflows/unit.yml

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.33% 🎉

Comparison is base (29dbd6b) 9.43% compared to head (aba7c2f) 9.76%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #181      +/-   ##
========================================
+ Coverage   9.43%   9.76%   +0.33%     
========================================
  Files        463     463              
  Lines      30853   30853              
  Branches     246     712     +466     
========================================
+ Hits        2911    3013     +102     
+ Misses     27935   27449     -486     
- Partials       7     391     +384     

Flag	Coverage Δ
unittests	9.76% <ø> (?)

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see 411 files with indirect coverage changes

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[michaelnchin]

Looks good, thanks @cubeddu !