Update CI workflow

[awvwgk]

• include ifx compiler

[codecov]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.03 ⚠️

Comparison is base (d7b892b) 65.97% compared to head (4ba672a) 65.95%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #135      +/-   ##
==========================================
- Coverage   65.97%   65.95%   -0.03%     
==========================================
  Files          29       29              
  Lines        3168     3169       +1     
  Branches     1350     1351       +1     
==========================================
  Hits         2090     2090              
+ Misses        393      388       -5     
- Partials      685      691       +6     

Impacted Files	Coverage Δ
src/tomlf/datetime.f90	69.42% <50.00%> (-0.58%)	⬇️

... and 5 files with indirect coverage changes

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