fix(ci): repair corrupted native/vcpkg.json builtin-baseline

A stray '混淆器' had been appended to the builtin-baseline SHA, leaving the JSON string unterminated; vcpkg manifest parsing failed in CI (Unexpected EOF in middle of string). Restore the clean 40-hex baseline (tag 2026.04.27 / qtbase 6.10.2).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

native/vcpkg.json

@@ -10,4 +10,5 @@
       "features": [ "widgets" ]
     }
   ],
-  "builtin-baseline": "56bb2411609227288b70117ead2c47585ba07713混淆器
+  "builtin-baseline": "56bb2411609227288b70117ead2c47585ba07713"
+}