fix(pypi): call python --version before marker eval #2819
                
     Merged
            
            
          
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bzlmodhas the full python version information statically and we don'tneed to call Python to get its version, but for
WORKSPACEthat is notthe case and we have to call it before evaluating the markers in
universal requirements files.
This also fixes transitions in the
compile_pip_requirementsmacro wherethe
.updatetarget would not transition correctly based on thepython_versionparameter.Fixes #2818