4808380 Update to 1.17.3

Authored and Committed by mfabian 8 months ago
    Update to 1.17.3
    
    - Support several backends for playing sounds
      Resolves: rhbz#2237674 https://bugzilla.redhat.com/show_bug.cgi?id=2237674
    - Update Unihan_Variants.txt and regenerate engine/chinese_variants.py to Unicode Version 15.1.0
    
        
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