ci: upgrade vcpkg to a commit that works for our deps with CMake 4.0

CMake 4.0 dropped support for projects with a minimum required version
below 3.5. libarchive, as well as possibly other dependencies, had older
versions set so they now fail to build.

GitHub Actions and MSYS2 were very quick to update their CMake version
and there isn't a tagged vcpkg release with a fix for libarchive yet, so
we will use a specific commit for now.

.github/workflows/build-macos.yml

@@ -4,13 +4,13 @@ on:
   push:
     branches:
       - master
-      - ci/vcpkg-update
+      - ci/*
   pull_request:
     branches:
       - master
 
 env:
-  VCPKG_COMMIT: 6f29f12e82a8293156836ad81cc9bf5af41fe836
+  VCPKG_COMMIT: 2ad004460f5db4d3b66f62f5799ff66c265c4b5d
   MELONDS_GIT_BRANCH: ${{ github.ref }}
   MELONDS_GIT_HASH: ${{ github.sha }}
   MELONDS_BUILD_PROVIDER: GitHub Actions

.github/workflows/build-windows.yml

@@ -10,7 +10,7 @@ on:
       - master
 
 env:
-  VCPKG_COMMIT: 6f29f12e82a8293156836ad81cc9bf5af41fe836
+  VCPKG_COMMIT: 2ad004460f5db4d3b66f62f5799ff66c265c4b5d
   MELONDS_GIT_BRANCH: ${{ github.ref }}
   MELONDS_GIT_HASH: ${{ github.sha }}
   MELONDS_BUILD_PROVIDER: GitHub Actions