chore: update lowest supported node versions (#8318)

Author: HuiSF

src/fragments/lib/project-setup/native_common/prereq/common_header.mdx

@@ -1,5 +1,5 @@
 Before you begin, make sure you have the following installed:
 
-- [Node.js](https://nodejs.org/) v16.x or later
-- [npm](https://www.npmjs.com/get-npm) v7.x or later
+- [Node.js](https://nodejs.org/) v18.x or later
+- [npm](https://www.npmjs.com/get-npm) v10.x or later
 - [git](https://git-scm.com/) v2.14.1 or later

src/fragments/lib/troubleshooting/common/upgrading.mdx

@@ -73,8 +73,8 @@ A key part of Amplify's React Native strategy going forward is to reduce our rel
 
 In order to use Amplify JavaScript v6, you will need to make sure you are using the following versions in your development environment:
 
-- [Node.js](https://nodejs.org/) v16.x or later
-- [npm](https://www.npmjs.com/) v9.7.1 or later
+- [Node.js](https://nodejs.org/) v18.x or later
+- [npm](https://www.npmjs.com/) v10.x or later
 
 ## Step 2: Upgrade your Amplify project dependencies