Implement `files_upload_v2` in Slack Provider

[Taragolis]

Body

Slack API files.upload method might failed due to timeout errors on large files, from slack-sdk>=3.19 there is also available method in client files_upload_v2 which should avoid this issues.

Need to implement in Slack API Hook and Operators possibility to use files_upload_v2 instead of files_upload, however this methods do not interchangable.

References:

• File Upload API succeeds despite 408 Request Timeout slackapi/python-slack-sdk#1165 (comment)
• SlackAPIFileOperator non-JSON Response 504 #35018 (comment)

Committer

• I acknowledge that I am a maintainer/committer of the Apache Airflow project.