Commit 54193969 for libheif

commit 541939696020187f1a2e37e3a91a8c363b86f93d
Author: Dirk Farin <dirk.farin@gmail.com>
Date:   Sat Mar 21 14:03:18 2026 +0100

    appveyor: upgrade dependencies when cache is not up-to-date

diff --git a/appveyor.yml b/appveyor.yml
index 5f1707c6..114777af 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -10,6 +10,7 @@ environment:
   - arch: arm64

 install:
+  - vcpkg upgrade --no-dry-run
   - vcpkg install aom:%arch%-windows
   - vcpkg install dav1d:%arch%-windows
   - vcpkg install ffmpeg[avcodec]:%arch%-windows