Update setuptools requirement from <68,>=65.5.1 to >=65.5.1,<69

Updates the requirements on [setuptools](https://github.com/pypa/setuptools) to permit the latest version.
- [Release notes](https://github.com/pypa/setuptools/releases)
- [Changelog](https://github.com/pypa/setuptools/blob/main/NEWS.rst)
- [Commits](pypa/setuptools@v65.5.1...v68.0.0)

---
updated-dependencies:
- dependency-name: setuptools
  dependency-type: direct:development
...

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

requirements-dev.txt

@@ -3,7 +3,7 @@ pytest>=6.2.1,<8
 pytest-cov>=2.12.1,<5
 pytest-timeout>=1.4.2,<3
 stubserver>=1.1,<2
-setuptools>=65.5.1,<68
+setuptools>=65.5.1,<69
 sphinx>=4,<6
 sphinx-autoapi
 sphinx-autodoc-typehints