Fix incorrect date parsing.

[allexzander]

No description provided.

[allexzander]

This fails to parse when built with Qt6, the assert gets triggered. I applied the same change as in here https://github.com/nextcloud/desktop/blob/master/src/libsync/discoveryphase.cpp#L470

[nextcloud-desktop-bot]

AppImage file: nextcloud-PR-6738-00022a3f9c803d91ae448aeaf3198153e01838f6-x86_64.AppImage

To test this change/fix you can simply download above AppImage file and test it.

Please make sure to quit your existing Nextcloud app and backup your data.

[sonarcloud]

Quality Gate failed

Failed conditions
D Maintainability Rating on New Code (required ≥ A)
2 New Code Smells (required ≤ 0)

See analysis details on SonarCloud

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[allexzander]

/backport to stable-3.13

[backportbot]

The backport to stable-3.13 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable-3.13
git pull origin stable-3.13

# Create the new backport branch
git checkout -b backport/6738/stable-3.13

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 00022a3f

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/6738/stable-3.13

Error: No changes found in backport branch

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.