chore: Bump fable from 5.0.0-rc.5 to 5.0.0-rc.6 (#235)

---
updated-dependencies:
- dependency-name: fable
  dependency-version: 5.0.0-rc.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.config/dotnet-tools.json

@@ -10,7 +10,7 @@
       "rollForward": false
     },
     "fable": {
-      "version": "5.0.0-rc.5",
+      "version": "5.0.0-rc.6",
       "commands": [
         "fable"
       ],