MDL-76507 behat: change step to use 'Recent and next 60 days' option

It was detected that 'This month' option may cause failures in builds in between months
so using the 'Recent and next 60 days' still fixes the weekend scenario and also the
in between months issue.

calendar/tests/behat/export.feature

@@ -42,7 +42,7 @@ Feature: Export calendar events
     When I click on "Import or export calendars" "link"
     And I click on "Export calendar" "button"
     And I set the field "All events" to "1"
-    And I set the field "This month" to "1"
+    And I set the field "Recent and next 60 days" to "1"
     And I press "Export"
     And I should see "SUMMARY:My event"
     # We need to split the step in two because Bennu library use days with leading zero and moodle removes it.