[FIX] Update vcpkg baseline to fix Windows build

Update vcpkg baseline from Feb 2024 to Dec 2025 to resolve libxml2
hash mismatch. GitLab regenerates archives dynamically, causing
SHA512 verification failures with old baselines.

Pin ffmpeg to 6.1.1 to maintain compatibility with rsmpeg 0.14.2.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: cfsmp3

.github/workflows/build_windows.yml

@@ -4,7 +4,7 @@ env:
   RUSTFLAGS: -Ctarget-feature=+crt-static
   VCPKG_DEFAULT_TRIPLET: x64-windows-static
   VCPKG_DEFAULT_BINARY_CACHE: C:\vcpkg\.cache
-  VCPKG_COMMIT: fba75d09065fcc76a25dcf386b1d00d33f5175af
+  VCPKG_COMMIT: ab2977be50c702126336e5088f4836060733c899
 
 on:
   workflow_dispatch:

windows/vcpkg.json

@@ -6,5 +6,12 @@
         "tesseract",
         "ffmpeg"
     ],
-    "builtin-baseline": "fba75d09065fcc76a25dcf386b1d00d33f5175af"
-}
+    "builtin-baseline": "ab2977be50c702126336e5088f4836060733c899",
+    "overrides": [
+        {
+            "name": "ffmpeg",
+            "version": "6.1.1",
+            "port-version": 11
+        }
+    ]
+}