Update required version of LXML
The previous required version of lxml (4.9.4) wasn't properly support on versions of macOS prior to Big Sur (11). LXML required version upped to 5.1.0.
The previous required version of lxml (4.9.4) wasn't properly support on versions of macOS prior to Big Sur (11). LXML required version upped to 5.1.0.