pin selenium==4.2

needed due to DashComposite AttributeError: 'WebDriver' object has no attribute 'find_element_by_css_selector' (see https://stackoverflow.com/a/72754667)

Author: janosh

tests/requirements.txt

@@ -9,6 +9,6 @@ dash-html-components
 dash-renderer
 ipdb
 percy
-selenium
+selenium==4.2 # pin needed due to DashComposite AttributeError: 'WebDriver' object has no attribute 'find_element_by_css_selector' (see https://stackoverflow.com/a/72754667)
 flake8
 pylint