ci(package.json): move ed64 and ffi-napi to optional dependencies

These dependencies are only used for local execution and tests. They prevent CI from installing deps
on Windows

package.json

@@ -51,10 +51,8 @@
     "@types/lodash": "^4.14.182",
     "commitizen": "^4.2.4",
     "cz-conventional-changelog": "^3.3.0",
-    "ed64": "^2.0.4",
     "esbuild": "^0.20.0",
     "eslint": "^7.32.0",
-    "ffi-napi": "^4.0.3",
     "jest": "^29.5.0",
     "postject": "^1.0.0-alpha.6",
     "prettier": "^2.4.0",
@@ -63,6 +61,10 @@
     "typescript": "^4.7.4",
     "zx": "^7.2.2"
   },
+  "optionalDependencies": {
+    "ffi-napi": "^4.0.3",
+    "ed64": "^2.0.4"
+  },
   "overrides": {
     "minimist": "1.2.6"
   },