[icalendar] Update to 6.1.* (#13109)

stubs/icalendar/METADATA.toml

@@ -1,6 +1,10 @@
-version = "~= 6.0.1"
+version = "6.1.*"
 upstream_repository = "https://github.com/collective/icalendar"
-requires = ["types-python-dateutil", "backports.zoneinfo; python_version<'3.9'"]
+requires = [
+    "types-python-dateutil",
+    "types-pytz",
+    "backports.zoneinfo; python_version<'3.9'",
+]
 
 [tool.stubtest]
 stubtest_requirements = ["pytz"]