Bump setuptools from 68.0.0 to 70.0.0 in /cocotb

Bumps [setuptools](https://github.com/pypa/setuptools) from 68.0.0 to 70.0.0.
- [Release notes](https://github.com/pypa/setuptools/releases)
- [Changelog](https://github.com/pypa/setuptools/blob/main/NEWS.rst)
- [Commits](pypa/setuptools@v68.0.0...v70.0.0)

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

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

Author: dependabot[bot]