[3.12] gh-129843: fix pure Python implementation of warnings.warn_explicit (GH-129848)
          #131350
        
          
      
      
        
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The pure Python implementation of
warnings.warn_explicitconstructs aWarningMessagewith an incorrect source (it incorrectly sets the WarningMessage's line to the given
source).(cherry picked from commit 80e00ec)
Co-authored-by: Srinivas Reddy Thatiparthy (తాటిపర్తి శ్రీనివాస్ రెడ్డి) [email protected]