build(vcpkg): add univesal-osx triplet

vcpkg doesn't officially support universal binaries, but this should
function as a workaround until it does one day

Signed-off-by: Seth Flynn <getchoo@tuta.io>

vcpkg-configuration.json

@@ -10,5 +10,8 @@
       "location": "https://github.com/microsoft/vcpkg-ce-catalog/archive/refs/heads/main.zip",
       "name": "microsoft"
     }
+  ],
+  "overlay-triplets": [
+    "./cmake/vcpkg-triplets"
   ]
 }