installing python3.8 and bumping version of thamos to latest

[Gregory-Pereira]

Related Issues and Dependencies

Addresses: thoth-station/support#204

This introduces a breaking change

• Yes
• No

This Pull Request implements

Bumping version of thamos, installing python3.8 so thamos install does not fail, adding other transative dependency of rich_click

[sesheta]

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[sesheta]

@Gregory-Pereira: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
aicoe-ci/prow/pre-commit	dd9418a	link	true	/test pre-commit

Full PR test history. Your PR dashboard. Please help us and open an issue when you hit one in your PR.

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[Gregory-Pereira]

Closing this issue, is already being addressed by #238 .