Add d3-color to package.json to fix cloudflare build. Will be replaced by Svelte UX format after design-token merge

Author: techniq

packages/layerchart/package.json

@@ -67,6 +67,7 @@
     "@mdi/js": "^7.3.67",
     "@types/d3-time": "^3.0.2",
     "d3-array": "^3.2.4",
+    "d3-color": "^3.1.0",
     "d3-delaunay": "^6.0.4",
     "d3-dsv": "^3.0.1",
     "d3-format": "^3.1.0",