build(deps-dev): update cyclonedx-python-lib requirement

Updates the requirements on [cyclonedx-python-lib](https://github.com/CycloneDX/cyclonedx-python-lib) to permit the latest version.
- [Release notes](https://github.com/CycloneDX/cyclonedx-python-lib/releases)
- [Changelog](https://github.com/CycloneDX/cyclonedx-python-lib/blob/main/CHANGELOG.md)
- [Commits](CycloneDX/cyclonedx-python-lib@v4.0.0...v6.0.0)

---
updated-dependencies:
- dependency-name: cyclonedx-python-lib
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -28,7 +28,7 @@ classifiers = [
 ]
 dependencies = [
     "CacheControl[filecache] >= 0.13.0",
-    "cyclonedx-python-lib >= 4,< 6",
+    "cyclonedx-python-lib >= 4,< 7",
     "html5lib>=1.1",
     "packaging>=23.0.0",                 # https://github.com/pypa/pip-audit/issues/464
     "pip-api>=0.0.28",