Update setuptools requirement from ~=52.0.0 to ~=68.1.0

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@v52.0.0...v68.1.0)

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

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

requirements.txt

@@ -1,4 +1,4 @@
-setuptools~=52.0.0
+setuptools~=68.1.0
 blessed~=1.18.0
 cmd2~=2.1.2
 pygame~=2.0.1