CI failure on Windows (R 4.1)

[yutannihilation]

Not sure if this is a problem related to Rtools40 or 32-bit (or both?), but it seems the CI fails due to ragg.

https://github.com/tidyverse/ggplot2/actions/runs/17668841738/job/50215825055#step:5:4498

  In file included from webp_anim_dev.cpp:3:
  AggDeviceWebPAnim.h:3:10: fatal error: webp/encode.h: No such file or directory
   #include <webp/encode.h>
            ^~~~~~~~~~~~~~~
  compilation terminated.
  make: *** [C:/R/etc/i386/Makeconf:245: webp_anim_dev.o] Error 1
  ERROR: compilation failed for package 'ragg'