[stubsabot] Bump icalendar to 6.3.2

Release: https://pypi.org/pypi/icalendar/6.3.2
Homepage: https://icalendar.readthedocs.io/
Repository: https://github.com/collective/icalendar
Typeshed stubs: https://github.com/python/typeshed/tree/main/stubs/icalendar
Changelog: https://icalendar.readthedocs.io/en/latest/changelog.html
Diff: collective/icalendar@v6.3.1...v6.3.2

Stubsabot analysis of the diff between the two releases:
 - Total lines of Python code added: 33.
 - Total lines of Python code deleted: 8.

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Author: stubsabot

stubs/icalendar/METADATA.toml

@@ -1,4 +1,4 @@
-version = "6.3.1"
+version = "6.3.2"
 upstream_repository = "https://github.com/collective/icalendar"
 requires = ["types-python-dateutil", "types-pytz"]