Corrected upper bound on Python versions

I had it at <=3.12 think this would get any 3.12.x version. But I was
mistaken and this actually blocked this 3.12 compatible version from
being installed under Python 3.12.

Author: emanlove

setup.py

@@ -42,7 +42,7 @@
     keywords         = 'robotframework testing testautomation selenium webdriver web',
     platforms        = 'any',
     classifiers      = CLASSIFIERS,
-    python_requires  = '>=3.8, <=3.12',
+    python_requires  = '>=3.8, <3.13',
     install_requires = REQUIREMENTS,
     package_dir      = {'': 'src'},
     packages         = find_packages('src'),