icalendar: update (#13737)

Fixes #13735

Author: hauntsaninja

stubs/icalendar/METADATA.toml

@@ -1,4 +1,4 @@
-version = "~= 6.1.2"
+version = "6.1.3"
 upstream_repository = "https://github.com/collective/icalendar"
 requires = ["types-python-dateutil", "types-pytz"]
 

stubs/icalendar/icalendar/timezone/tzid.pyi

@@ -5,4 +5,3 @@ __all__ = ["tzid_from_tzinfo", "tzid_from_dt", "tzids_from_tzinfo"]
 def tzids_from_tzinfo(tzinfo: datetime.tzinfo | None) -> tuple[str, ...]: ...
 def tzid_from_tzinfo(tzinfo: datetime.tzinfo | None) -> str | None: ...
 def tzid_from_dt(dt: datetime.datetime) -> str | None: ...
-def tzinfo2tzids(tzinfo: datetime.tzinfo | None) -> set[str]: ...