fix: Add sabre vobject rdate patch

[SebastianKrupinski]

• Resolves: https://github.com/nextcloud/calendar/pull/7683#issuecomment-3539763984

Summary

• Added sabre vobject rdate patch
• [ ] Requires https://github.com/nextcloud/3rdparty/pull/2209
• [ ] Rebase

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• [ ] Tests (unit, integration, api and/or acceptance) are included
• [ ] Screenshots before/after for front-end changes
• [ ] Documentation (manuals or wiki) has been updated or is not required
• [ ] Backports requested where applicable (ex: critical bugfixes)
• [ ] Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• [ ] Milestone added for target branch/version (ex: 32.x for stable32)

[SebastianKrupinski]

👍 but please make this a fix:. You are not adding a feature.

Done

[SebastianKrupinski]

@kesselb please +1