Change using-preact example dependencies and docs (vercel#30394)

* change use-preact dependencies

* change stackblitz url to use https protocol

* change deprecated thing from the webpack5 doc

errors/webpack5.md

@@ -37,7 +37,7 @@ In case you do have custom webpack configuration, either through custom plugins
 
 - When using `next-transpile-modules` make sure you use the latest version which includes [this patch](https://github.com/martpie/next-transpile-modules/pull/179)
 - When using `@zeit/next-css` / `@zeit/next-sass` make sure you use the [built-in CSS/Sass support](https://nextjs.org/docs/basic-features/built-in-css-support) instead
-- When using `@zeit/next-preact` use [this example](https://github.com/vercel/next-plugins/tree/master/packages/next-preact) instead
+- When using `@zeit/next-preact` use [this example](https://github.com/vercel/next.js/tree/canary/examples/using-preact) instead
 - When using `@zeit/next-source-maps` use the [built-in production Source Map support](https://nextjs.org/docs/advanced-features/source-maps)
 - When using webpack plugins make sure they're upgraded to the latest version, in most cases the latest version will include webpack 5 support. In some cases these upgraded webpack plugins will only support webpack 5.
 

examples/using-preact/README.md

@@ -4,7 +4,7 @@ This example uses [Preact](https://github.com/preactjs/preact) instead of React.
 
 ## Preview
 
-Preview the example live on [StackBlitz](http://stackblitz.com/):
+Preview the example live on [StackBlitz](https://stackblitz.com/):
 
 [![Open in StackBlitz](https://developer.stackblitz.com/img/open_in_stackblitz.svg)](https://stackblitz.com/github/vercel/next.js/tree/canary/examples/using-preact)
 

examples/using-preact/package.json

@@ -7,12 +7,12 @@
   },
   "devDependencies": {},
   "dependencies": {
-    "next": "^10.0.0",
-    "next-plugin-preact": "^3.0.3",
-    "preact": "^10.5.5",
-    "preact-render-to-string": "^5.1.11",
-    "react": "npm:@preact/compat",
-    "react-dom": "npm:@preact/compat",
-    "react-ssr-prepass": "npm:preact-ssr-prepass@^1.1.2"
+    "next": "^12.0.0",
+    "next-plugin-preact": "^3.0.6",
+    "preact": "^10.5.15",
+    "preact-render-to-string": "^5.1.19",
+    "react": "npm:@preact/compat@^17.0.2",
+    "react-dom": "npm:@preact/compat@^17.0.2",
+    "react-ssr-prepass": "npm:preact-ssr-prepass@^1.2.0"
   }
 }