Set version to 5.50.beta1

ext/afform/admin/info.xml

ext/afform/core/info.xml

ext/afform/html/info.xml

ext/afform/mock/info.xml

ext/authx/info.xml

ext/civicrm_admin_ui/info.xml

ext/civigrant/info.xml

ext/ckeditor4/info.xml

ext/contributioncancelactions/info.xml

ext/eventcart/info.xml

ext/ewaysingle/info.xml

ext/financialacls/info.xml

ext/flexmailer/info.xml

ext/greenwich/info.xml

ext/legacycustomsearches/info.xml

ext/message_admin/info.xml

ext/oauth-client/info.xml

ext/payflowpro/info.xml

ext/recaptcha/info.xml

ext/search_kit/info.xml