Added .NET Core SDK version 3.1.408. (#10720)

manifests/m/Microsoft/dotnet/3.1.408/Microsoft.dotnet.installer.yaml

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+# yaml-language-server: $schema=https://aka.ms/winget-manifest.installer.1.0.0.schema.json
+PackageIdentifier: Microsoft.dotnet
+PackageVersion: 3.1.408
+MinimumOSVersion: 6.1.7601
+Commands:
+- dotnet
+InstallerType: exe
+Installers:
+- Architecture: x64
+  InstallerUrl: https://download.visualstudio.microsoft.com/download/pr/fa20039c-5871-4597-8a7b-f0553a12edcc/4fb1cce6214049fe639dd230a9265133/dotnet-sdk-3.1.408-win-x64.exe
+  InstallerSha256: 2B0A9151FE35E4AB65608A0552F4335380CF1B2483AD2E9D42CF842D38CA2EED
+  InstallerSwitches:
+    Custom: /install
+    Silent: /quiet
+    SilentWithProgress: /passive
+- Architecture: x86
+  InstallerUrl: https://download.visualstudio.microsoft.com/download/pr/d5821095-b8e2-47fd-b6a0-815beeefb0d4/f9b8a167f7e389b5e0207ada20caa1e9/dotnet-sdk-3.1.408-win-x86.exe
+  InstallerSha256: 4AFD5602103145EBA8320098D8F9F0BACD2C00FFBBBC6C2CAF8366236E73EE7D
+  InstallerSwitches:
+    Custom: /install
+    Silent: /quiet
+    SilentWithProgress: /passive
+ManifestType: installer
+ManifestVersion: 1.0.0
+

manifests/m/Microsoft/dotnet/3.1.408/Microsoft.dotnet.locale.en-US.yaml

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+# yaml-language-server: $schema=https://aka.ms/winget-manifest.defaultlocale.1.0.0.schema.json
+PackageIdentifier: Microsoft.dotnet
+PackageVersion: 3.1.408
+PackageLocale: en-US
+Moniker: dotnet
+LicenseUrl: https://github.com/dotnet/core/blob/master/LICENSE.TXT
+Description: .NET Core is an open-source, general-purpose development platform. You can create .NET Core apps for Windows, macOS, and Linux for x64, x86, ARM32, and ARM64 processors using multiple programming languages. Frameworks and APIs are provided for cloud, IoT, client UI, and machine learning.
+PackageUrl: https://docs.microsoft.com/dotnet/core/
+Tags:
+- .NET
+- .NET Core
+- dotnet
+- net
+- C#
+- csharp
+- F#
+- fsharp
+- VB
+- Visual Basic
+Publisher: Microsoft
+PackageName: .NET Core SDK
+License: MIT
+ShortDescription: Microsoft.dotnet
+ManifestType: defaultLocale
+ManifestVersion: 1.0.0
+

manifests/m/Microsoft/dotnet/3.1.408/Microsoft.dotnet.yaml

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+# yaml-language-server: $schema=https://aka.ms/winget-manifest.version.1.0.0.schema.json
+PackageIdentifier: Microsoft.dotnet
+PackageVersion: 3.1.408
+DefaultLocale: en-US
+ManifestType: version
+ManifestVersion: 1.0.0
+