Merge pull request #1006 from fsharp/dependabot/nuget/fsdocs-tool-21.0.0-beta-004

Bump fsdocs-tool from 21.0.0-beta-003 to 21.0.0-beta-004

Author: nojaf

.config/dotnet-tools.json

@@ -3,7 +3,7 @@
   "isRoot": true,
   "tools": {
     "fsdocs-tool": {
-      "version": "21.0.0-beta-003",
+      "version": "21.0.0-beta-004",
       "commands": [
         "fsdocs"
       ],