Merge the microbuild branch from https://github.com/aarnott/Library.Template

Specifically, this merges [3453297 from that repo](AArnott/Library.Template@3453297).

Author: AArnott

.config/dotnet-tools.json

@@ -38,11 +38,11 @@
       "rollForward": false
     },
     "dotnet-symbol": {
-      "version": "10.0.721401",
+      "version": "9.0.661903",
       "commands": [
         "dotnet-symbol"
       ],
       "rollForward": false
     }
   }
-}
+}