Bump sybil from 8.0.1 to 9.0.0

Bumps [sybil](https://github.com/simplistix/sybil) from 8.0.1 to 9.0.0.
- [Changelog](https://github.com/simplistix/sybil/blob/master/CHANGELOG.rst)
- [Commits](simplistix/sybil@8.0.1...9.0.0)

---
updated-dependencies:
- dependency-name: sybil
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

pyproject.toml

@@ -93,7 +93,7 @@ optional-dependencies.dev = [
     "sphinx-toolbox==3.8.1",
     "sphinxcontrib-httpdomain==1.8.1",
     "sphinxcontrib-spelling==8",
-    "sybil==8.0.1",
+    "sybil==9.0.0",
     "tenacity==9.0.0",
     "types-docker==7.1.0.20240827",
     "types-pyyaml==6.0.12.20240917",