Bump up dotnet version to fix CG alerts

GangWang01 · GangWang01 · commit d1f5d4c6d7ef · 2023-08-02T09:35:27.000Z
diff --git a/global.json b/global.json
@@ -3,7 +3,7 @@
     "allowPrerelease": true
   },
   "tools": {
-    "dotnet": "7.0.304",
+    "dotnet": "7.0.306",
     "vs": {
       "version": "17.4.1"
     },
