Fix CI

Author: orta

test/package.json

@@ -5,6 +5,6 @@
     "@rollup/plugin-node-resolve": "9.0.0",
     "webpack": "4.44.2",
     "webpack-cli": "3.3.12",
-    "snowpack": "^2.12.1"
+    "snowpack": "2.12.1"
   }
 }