Fix: Change slack file upload method to uploadV2

[virus-rpi]

Change:

• use the new uploadV2 method instead of the upload method

https://api.slack.com/changelog/2024-04-a-better-way-to-upload-files-is-here-to-stay#prepare

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[hofmann-felix]

LGTM 🚀 Thank you for taking care of this

Can you please change these three things before the merge:

1. Fix the typo in the PR description
2. Assign yourself to the related issue
3. Ensure that the commit message on main is lower case (fix: change slack file upload method to uploadV2). We should always try to be consistent with the other commits.