Bump minimum Node.js version to 14.6.0 (#41765)

We found a case where 14.0.0 breaking with private class methods, such
as:

```js
class C {
  #x() { return 42; }
  x() {
    return this.#x();
  }
}
```

This feature was introduced in Node.js 14.6.0, so we can bump the
minimum version.

See https://node.green

docs/getting-started.md

@@ -14,7 +14,7 @@ If you have questions about anything related to Next.js, you're always welcome t
 
 #### System Requirements
 
-- [Node.js 14.0.0](https://nodejs.org/) or newer
+- [Node.js 14.6.0](https://nodejs.org/) or newer
 - MacOS, Windows (including WSL), and Linux are supported
 
 ## Automatic Setup

docs/upgrading.md

@@ -8,7 +8,7 @@ description: Learn how to upgrade Next.js.
 
 The [Supported Browsers](/docs/basic-features/supported-browsers-features.md) have been changed to drop Internet Explorer and target modern browsers.
 
-The minimum Node.js version has been bumped from 12.22.0 to 14.0.0, since 12.x has reached end-of-life.
+The minimum Node.js version has been bumped from 12.22.0 to 14.6.0, since 12.x has reached end-of-life.
 
 The minimum React version has been bumped from 17.0.2 to 18.2.0.
 

package.json

@@ -217,7 +217,7 @@
     "@babel/traverse": "7.18.0"
   },
   "engines": {
-    "node": ">=14.0.0"
+    "node": ">=14.6.0"
   },
   "packageManager": "pnpm@7.3.0"
 }

packages/create-next-app/package.json

@@ -49,6 +49,6 @@
     "validate-npm-package-name": "3.0.0"
   },
   "engines": {
-    "node": ">=14.0.0"
+    "node": ">=14.6.0"
   }
 }

packages/next/package.json

@@ -293,6 +293,6 @@
     "caniuse-lite": "1.0.30001406"
   },
   "engines": {
-    "node": ">=14.0.0"
+    "node": ">=14.6.0"
   }
 }

packages/next/taskfile-swc.js

@@ -66,7 +66,7 @@ module.exports = function (task) {
         env: {
           targets: {
             // follow the version defined in packages/next/package.json#engine
-            node: '14.0.0',
+            node: '14.6.0',
           },
         },
         jsc: {