Update gradle in libwebp.

[jellefoks]

This upgrades gradle in libwebp.

b/0nobug

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 59.91%. Comparing base (e797850) to head (48cb2d3). Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2807      +/-   ##
==========================================
+ Coverage   59.82%   59.91%   +0.09%     
==========================================
  Files        1830     1830              
  Lines       88549    88549              
==========================================
+ Hits        52976    53056      +80     
+ Misses      35573    35493      -80     

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