feh: update to 3.10

Thu, 06 Apr 2023 16:19:16 +0200

* Release v3.10
    * Add --sort=none option to un-set sort modes specified earlier
    * Improve error messages for Imlib2 ≥ 1.8
    * Fix build with clang 16. (Patch by orbea)
    * Fix tests when building with magic=1

(nia)