feat(dependabot): add support for vcpkg (SchemaStore#4907)

Author: JamieMagee

src/schemas/json/dependabot-2.0.json

@@ -669,7 +669,8 @@
         "pub",
         "swift",
         "terraform",
-        "uv"
+        "uv",
+        "vcpkg"
       ]
     },
     "schedule-day": {