Update .NET SDK to latest version

Author: pwshBot

DotnetRuntimeMetadata.json

@@ -4,7 +4,7 @@
     "quality": "daily",
     "qualityFallback": "preview",
     "packageVersionPattern": "9.0.0-preview.6",
-    "sdkImageVersion": "9.0.301",
+    "sdkImageVersion": "9.0.303",
     "nextChannel": "9.0.0-preview.7",
     "azureFeed": "",
     "sdkImageOverride": ""

global.json

@@ -1,5 +1,5 @@
 {
   "sdk": {
-    "version": "9.0.301"
+    "version": "9.0.303"
   }
 }