Use latest .NET 6.0 SDK patch version and update devcontainer to use .NET 6 as well (#1955)

* Update global.json

* Update README.md

* Update Dockerfile

* Update devcontainer.json

* Update devcontainer.json

* Update devcontainer.json

* Update global.json

Author: bergmeister

.devcontainer/Dockerfile

@@ -1,6 +1,6 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # Licensed under the MIT License.
 
-FROM mcr.microsoft.com/dotnet/core/sdk:3.1.419
+FROM mcr.microsoft.com/dotnet/sdk:6.0
 
 RUN pwsh --command Install-Module platyPS,Pester -Force

.devcontainer/devcontainer.json

@@ -1,14 +1,16 @@
-// For format details, see https://aka.ms/vscode-remote/devcontainer.json or the definition README at
-// https://github.com/microsoft/vscode-dev-containers/tree/master/containers/dotnetcore-3.0
+// For format details, see https://aka.ms/vscode-remote/devcontainer.json
 {
-	"name": "C# (.NET Core 3.1)",
+	"name": "C# (.NET 6.0)",
 	"dockerFile": "Dockerfile",
-	"settings": {
-		"terminal.integrated.shell.linux": "/usr/bin/pwsh"
-	},
-	"postCreateCommand": "dotnet restore",
-	"extensions": [
-		"ms-dotnettools.csharp",
-		"ms-vscode.powershell-preview"
-	]
+	"customizations": {
+		"vscode": {
+			"settings": {
+				"terminal.integrated.defaultProfile.linux": "pwsh"
+			},
+			"extensions": [
+				"ms-dotnettools.csharp",
+				"ms-vscode.powershell"
+			]
+		}
+	}
 }

README.md

@@ -72,8 +72,7 @@ To install **PSScriptAnalyzer** from source code:
 
 ### Requirements
 
-- [.NET 6.0.11 containing 6.0.403 SDK](https://dotnet.microsoft.com/en-us/download/dotnet/6.0) or
-  newer patch release
+- [Latest .NET 6.0 SDK](https://dotnet.microsoft.com/en-us/download/dotnet/6.0)
 * If building for Windows PowerShell versions, then the .NET Framework 4.6.2 [targeting pack](https://dotnet.microsoft.com/en-us/download/dotnet-framework/net462) (also referred to as developer/targeting pack) need to be installed. This is only possible on Windows.
 * Optionally but recommended for development: [Visual Studio 2017/2019](https://www.visualstudio.com/downloads)
 - [Pester v5 PowerShell module, available on PowerShell Gallery](https://github.com/pester/Pester)

global.json

@@ -1,5 +1,5 @@
 {
     "sdk": {
-        "version": "6.0.403"
+        "version": "6.0.418"
     }
 }