Fix issue with proxy imports not reloading on change (#462)

Underlying issue fixed in Snowpack here: FredKSchott/snowpack#3449

packages/astro/package.json

@@ -87,7 +87,7 @@
     "sass": "^1.32.13",
     "shorthash": "^0.0.2",
     "slash": "^4.0.0",
-    "snowpack": "^3.5.7",
+    "snowpack": "^3.5.8",
     "source-map-support": "^0.5.19",
     "string-width": "^5.0.0",
     "tiny-glob": "^0.2.8",

yarn.lock

@@ -8935,10 +8935,10 @@ smartwrap@^1.2.3:
     wcwidth "^1.0.1"
     yargs "^15.1.0"
 
-snowpack@^3.5.7:
-  version "3.5.7"
-  resolved "https://registry.yarnpkg.com/snowpack/-/snowpack-3.5.7.tgz#1d56a273c97e6f8fe23800f4d3c641eefb65f356"
-  integrity sha512-mMdbG9vSs7JL69/Zk2VtpduBnbfzCCCXvhJeX4GzPg4aYyKtfs0s6MA5VoQbN9HL6lZpKRy/knaigKcC4E29GA==
+snowpack@^3.5.8:
+  version "3.5.8"
+  resolved "https://registry.yarnpkg.com/snowpack/-/snowpack-3.5.8.tgz#2132cca27e593aee619df671dcc68290c0b68889"
+  integrity sha512-o0oyNpjnmFywPPgNhVt8ofa2RPBQqScxnFNbf15H9B+sH5UyrgYmy4qeJAnipsQqT9CT7i9Mx2Q5Ccm5vlfHSQ==
   dependencies:
     cli-spinners "^2.5.0"
     default-browser-id "^2.0.0"