Prepare release 0.8.0

[kaklakariada]

< PR SPECIFIC CONTENT >

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✔ Checklist(s)

• Is the title of the Pull Request correct?
• Is the title of the corresponding issue correct?
• Have you updated the changelog?
• Have you updated the templates?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Are you mentioning the issue which this PullRequest fixes ("Fixes...")

🦺 Github Actions

• Did you update the version pinning in the action(s)
  • security-issues (exasol-toolbox)
    -> Only for releases!!

Note: If any of the above is not relevant to your PR just check the box.