Update SDK (#35390)

global.json

 {
   "sdk": {
-    "version": "6.0.100-rc.1.21413.1"
+    "version": "6.0.100-rc.1.21415.3"
   },
   "tools": {
-    "dotnet": "6.0.100-rc.1.21413.1",
+    "dotnet": "6.0.100-rc.1.21415.3",
     "runtimes": {
       "dotnet/x64": [
         "2.1.27",