chore(deps): update rich requirement in the dev-dependencies group

Updates the requirements on [rich](https://github.com/Textualize/rich) to permit the latest version.

Updates `rich` to 15.0.0
- [Release notes](https://github.com/Textualize/rich/releases)
- [Changelog](https://github.com/Textualize/rich/blob/master/CHANGELOG.md)
- [Commits](Textualize/rich@v13.0.0...v15.0.0)

---
updated-dependencies:
- dependency-name: rich
  dependency-version: 15.0.0
  dependency-type: direct:production
  dependency-group: dev-dependencies
...

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

Author: dependabot[bot]

pyproject.toml

@@ -35,7 +35,7 @@ dependencies = [
     "docling-core[chunking, chunking-openai]>=2.50.0,<3.0.0",
     "pydantic>=2.0.0,<3.0.0",
     "networkx>=3.0.0,<4.0.0",
-    "rich>=13,<15",
+    "rich>=13,<16",
     "typer[all]>=0.12,<1.0.0",
     "python-dotenv>=1.0,<2.0",
     "litellm>=1.0.0,<2.0.0",