Bump ical to 7.0.3 to fix local-todo persisted with invalid DTSTART values

[allenporter]

Proposed change

Bump ical to 7.0.3:
Release Notes: https://github.com/allenporter/ical/releases/tag/7.0.3
Full changelog: allenporter/ical@7.0.2...7.0.3

Previously this test fails with:

  Failed to validate: TZID=CST;20231024T113000, errors: (['Expected value to match DATE-TIME pattern: TZID=CST;20231024T113000', "Expected value to match DATE pattern: 'TZID=CST;20231024T113000'"]) (type=value_error)

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Can't recover two To Do lists previously available before 2024.3.0 & 2024.3.1. (See #112647) #113445 To Do list persisted with invalid system timezone #113421
• This PR is related to issue:
• Link to documentation pull request:

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[allenporter]

Looks like the tests are still failing

[allenporter]

Fixed, I forgot to push the change to actually set 7.0.3 as the version (was still using 7.0.2 before)