fix: pin CalDAV dependency

[oleksandr-nc]

CalDAV version 3+ introduce some breaking changes, temporary pin it to skip that version

Summary by CodeRabbit

• Chores
  • Restricted caldav dependency to the 2.x version line to prevent compatibility issues with future major versions.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: c7a16334-b47f-4f2d-9cf3-232824c48784

📥 Commits

Reviewing files that changed from the base of the PR and between c586672 and 59c940e.

📒 Files selected for processing (1)

• pyproject.toml

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📝 Walkthrough

Walkthrough

The caldav optional dependency constraint is tightened from >=2.2.6 to >=2.2.6,<3, restricting to the 2.x release line and excluding major version 3.

Changes

Cohort / File(s)	Summary
Dependency Version Constraint pyproject.toml	Tightens caldav optional dependency upper bound to exclude major version 3, pinning to the 2.x release series.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: pinning the CalDAV dependency to exclude breaking changes in version 3.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/pin-caldav

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