Move to .NET 10p6 (#79438)

* Move to .NET 10p6

Let's try to get ahead of the next one.

* Update contributing docs as well.

Author: 333fred

docs/contributing/Building, Debugging, and Testing on Unix.md

@@ -12,7 +12,7 @@ Particularly for developers who aren't experienced with .NET Core development on
 1. Install [VS Code](https://code.visualstudio.com/Download)
     - After you install VS Code, install the [C# extension](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.csharp)
     - Important tip: You can look up editor commands by name by hitting *Ctrl+Shift+P*, or by hitting *Ctrl+P* and typing a `>` character. This will help you get familiar with editor commands mentioned below. On a Mac, use *⌘* instead of *Ctrl*.
-1. Install the [.NET 9.0 SDK](https://dotnet.microsoft.com/en-us/download/dotnet/9.0) which matches the `sdk.version` property in [global.json](../../global.json#L3)
+1. Install the [.NET 10.0 SDK](https://dotnet.microsoft.com/en-us/download/dotnet/10.0) which matches the `sdk.version` property in [global.json](../../global.json#L3)
 3. You can build from VS Code by running the *Run Build Task* command, then selecting an appropriate task such as *build* or *build current project* (the latter builds the containing project for the current file you're viewing in the editor).
 4. You can run tests from VS Code by opening a test class in the editor, then using the *Run Tests in Context* and *Debug Tests in Context* editor commands. You may want to bind these commands to keyboard shortcuts that match their Visual Studio equivalents (**Ctrl+R, T** for *Run Tests in Context* and **Ctrl+R, Ctrl+T** for *Debug Tests in Context*).
 5. You can launch a new VS Code instance with the language server from your current code by running the "launch vscode with language server" task.

docs/contributing/Building, Debugging, and Testing on Windows.md

@@ -20,7 +20,7 @@ The minimal required version of .NET Framework is 4.7.2.
     - Ensure C# and Visual Basic, MSBuild, and .NET Core are included in the selected individual components
     - Ensure "Use previews of the .NET Core SDK" is checked in Tools -> Options -> Environment -> Preview Features
     - Restart Visual Studio
-1. Install the [.NET 9.0 SDK](https://dotnet.microsoft.com/en-us/download/dotnet/9.0) which matches the `sdk.version` property in [global.json](../../global.json#L3)
+1. Install the [.NET 10.0 SDK](https://dotnet.microsoft.com/en-us/download/dotnet/10.0) which matches the `sdk.version` property in [global.json](../../global.json#L3)
 1. [PowerShell 5.0 or newer](https://docs.microsoft.com/en-us/powershell/scripting/setup/installing-windows-powershell). If you are on Windows 10, you are fine; you'll only need to upgrade if you're on earlier versions of Windows. The download link is under the ["Upgrading existing Windows PowerShell"](https://docs.microsoft.com/en-us/powershell/scripting/install/installing-windows-powershell?view=powershell-6#upgrading-existing-windows-powershell) heading.
 1. Run Restore.cmd
 1. Open Roslyn.sln

global.json

@@ -1,11 +1,11 @@
 {
   "sdk": {
-    "version": "10.0.100-preview.5.25277.114",
+    "version": "10.0.100-preview.6.25358.103",
     "allowPrerelease": false,
     "rollForward": "patch"
   },
   "tools": {
-    "dotnet": "10.0.100-preview.5.25277.114",
+    "dotnet": "10.0.100-preview.6.25358.103",
     "vs": {
       "version": "17.14.0"
     },