Bump ical to 6.1.0

[allenporter]

Proposed change

Release notes: https://github.com/allenporter/ical/releases/tag/6.1.0
Changs: allenporter/ical@6.0.0...6.1.0

Motivation is to see if this addresses timeout issues in #103483 by dropping dependency on emoji library which loads a 2MB .py file. The other changes includes adding support for parent/child relationships which are not yet used by Home Assistant, but can be used if/when we want to improve To-do with parent/child.

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[allenporter]

CI checks break because ical no longer depends on emoji, and this breaks mypy for another library:

Error: venv/lib/python3.11/site-packages/slixmpp/plugins/xep_0444/stanza.py:9: error: Cannot find implementation or library stub for module named "emoji"  [import-not-found]
venv/lib/python3.11/site-packages/slixmpp/plugins/xep_0444/stanza.py:9: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
Found 1 error in 1 file (checked 6268 source files)
Error: Process completed with exit code 1.

It looks like slixmpp does not directly depend on emoji, but tries to import it and if it can't be imported it catches the ImportError with a fallback
https://github.com/poezio/slixmpp/blob/7a0fb970833c778ed50dcb49c5b7b4043d57b1e5/slixmpp/plugins/xep_0444/stanza.py#L9

After reading the mypy guidance, I'm not sure what the right fix is. I don't think the answer is for ical to keep an unnecessary dependency on emoji. I'm not sure that what slixmpp is doing is wrong. Not sure what mypi is doing is necessarily wrong either or if its a good idea to suppress or how.

Would appreciate feedback on how to proceed.

[frenck]

@allenporter I would add emoji library to the manifest the other integration to fix this for now.

[frenck]

Thanks, @allenporter 👍

../Frenck