Update .NET SDK

Update to the 7.0.200 SDK with the appropriate build changes required as #1036 broke the CI.

Author: martincostello

build.cake

@@ -225,7 +225,7 @@ Task("__CreateSignedNuGetPackage")
         },
     };
 
-    DotNetPack(System.IO.Path.Combine(srcDir, projectName + ".sln"), dotNetPackSettings);
+    DotNetPack(System.IO.Path.Combine(srcDir, projectName, projectName + ".csproj"), dotNetPackSettings);
 });
 
 //////////////////////////////////////////////////////////////////////

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "7.0.103",
+    "version": "7.0.200",
     "allowPrerelease": false,
     "rollForward": "latestMajor"
   }