Update version and date

Author: douglm

sources/draft-ietf-calext-ical-tasks.adoc

@@ -1,14 +1,14 @@
 = Task Extensions to iCalendar
 :doctype: internet-draft
-:docnumber: draft-ietf-calext-ical-tasks-14
+:docnumber: draft-ietf-calext-ical-tasks-15
 :status: standard
 :ipr: trust200902
 :consensus: true
 :updates: RFC5545
 :submission-type: IETF
 :area: Internet
 :intended-series: full-standard
-:revdate: 2025-07-07
+:revdate: 2025-08-05
 :fullname: Adrian Apthorp
 :lastname: Apthorp
 :forename_initials: A.