ci: Update swift-code-coverage.yml and drop swift 5.8 build

[freef4ll]

Description

Include a summary of the change and which issue is fixed. Please also include relevant motivation and context.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

Minimal checklist:

• I have performed a self-review of my own code
• I have added DocC code-level documentation for any public interfaces exported by the package
• I have added unit and/or integration tests that prove my fix is effective or that my feature works

[github-actions]

Pull request had an unknown failure
Pull request benchmark comparison [ubuntu-latest] with 'main' run at 2024-10-14T06:56:10+00:00

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.55%. Comparing base (75e8622) to head (670d549).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #280      +/-   ##
==========================================
+ Coverage   65.32%   70.55%   +5.23%     
==========================================
  Files          33       32       -1     
  Lines        3610     2927     -683     
==========================================
- Hits         2358     2065     -293     
+ Misses       1252      862     -390     

see 1 file with indirect coverage changes

see 1 file with indirect coverage changes

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