Bump nbgv from 3.6.139 to 3.6.141 (#271)

Author: dependabot[bot]

.config/dotnet-tools.json

@@ -10,7 +10,7 @@
       "rollForward": false
     },
     "nbgv": {
-      "version": "3.6.139",
+      "version": "3.6.141",
       "commands": [
         "nbgv"
       ],