Add selenium-manager executables to python manifest (SeleniumHQ#13998)

Add selenium-manager artifacts to python manifest

Co-authored-by: Diego Molina <diemol@users.noreply.github.com>

Author: 2 people

py/MANIFEST.in

@@ -15,6 +15,9 @@ recursive-include selenium/webdriver/support *.py
 include selenium/selenium.py
 include selenium/__init__.py
 include selenium/py.typed
+include selenium/webdriver/common/linux/selenium-manager
+include selenium/webdriver/common/macos/selenium-manager
+include selenium/webdriver/common/windows/selenium-manager.exe
 include CHANGES
 include README.rst
 include LICENSE