Bump Fantomas.Core from 6.3.13 to 6.3.15 in /src/server/FantomasOnlin…

…eV6 (#649)

Bumps [Fantomas.Core](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.Core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/server/FantomasOnlineV6/FantomasOnlineV6.fsproj

@@ -23,7 +23,7 @@
     <Compile Include="Program.fs" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Fantomas.Core" Version="6.3.13" />
+    <PackageReference Include="Fantomas.Core" Version="6.3.15" />
     <PackageReference Include="FSharp.Core" Version="6.0.6" />
     <PackageReference Include="Thoth.Json.Net" Version="8.0.0" />
   </ItemGroup>