Bump fantomas from 6.3.13 to 6.3.15

Bumps [fantomas](https://github.com/fsprojects/fantomas) from 6.3.13 to 6.3.15.
- [Release notes](https://github.com/fsprojects/fantomas/releases)
- [Changelog](https://github.com/fsprojects/fantomas/blob/main/CHANGELOG.md)
- [Commits](fsprojects/fantomas@v6.3.13...v6.3.15)

---
updated-dependencies:
- dependency-name: fantomas
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

.config/dotnet-tools.json

@@ -21,7 +21,7 @@
       ]
     },
     "fantomas": {
-      "version": "6.3.13",
+      "version": "6.3.15",
       "commands": [
         "fantomas"
       ]