Bump fantomas to v6.1 (#2918)

Author: nojaf

.config/dotnet-tools.json

@@ -9,7 +9,7 @@
       ]
     },
     "fantomas": {
-      "version": "6.0.0",
+      "version": "6.1.0",
       "commands": [
         "fantomas"
       ]