Fix remaining Node.js version references from 18.18 to 20.0.0

Co-authored-by: anupriya13 <54227869+anupriya13@users.noreply.github.com>

Author: Copilot

packages/@react-native-windows/cli/src/commands/healthCheck/healthCheckList.ts

@@ -12,7 +12,7 @@ export const HealthCheckList = [
   [true, 'DeveloperMode', 'Developer mode is on'],
   [true, 'LongPath', 'Long path support is enabled'],
   [true, 'VSUWP', 'Visual Studio 2022 (>= 17.11.0) & req. components'],
-  [true, 'Node', 'Node.js (LTS, >= 18.18)'],
+  [true, 'Node', 'Node.js (LTS, >= 20.0.0)'],
   [true, 'Yarn', 'Yarn'],
   [true, 'DotNetCore', '.NET SDK (LTS, = 6.0)'],
 ];

vnext/Scripts/rnw-dependencies.ps1

@@ -438,7 +438,7 @@ $requirements = @(
     },
     @{
         Id=[CheckId]::Node;
-        Name = 'Node.js (LTS, >= 18.18)';
+        Name = 'Node.js (LTS, >= 20.0.0)';
         Tags = @('appDev');
         Valid = { CheckNode; }
         Install = { WinGetInstall OpenJS.NodeJS.LTS "20.0.0" };