Bump minimum required python version from 3.7 to 3.8

[zarch]

mkdocs-material==9.5.33 depends on Python>=3.8 therefore we should:

• upgrade the minimum python version of typer to a compatible version and therefore change pyproject.toml file or
• downgrade mkdocs-material to a compatible version with python 3.7.

Considering that Python3.7 end of life was 2023-06-27, it seems reasonable to require as minimum version python3.8 (end of life due 2024-10).

See discussion

[github-actions]

📝 Docs preview for commit 5cb3b98 at: https://39a79517.typertiangolo.pages.dev

[svlandeg]

Thanks for the PR!

Our build-docs workflow is run on a Python 3.11 instance, so I don't think there's an issue with the versioning of mkdocs-material. [Update: actually, let me look into this more.]

We will drop support for Python 3.7 at some point though. When we do, we'll need many more changes than just changing the project.toml. This work is already being prepared in PR #830. We can close this PR and continue in #830.

[svlandeg]

According to the mkdocs-material release notes, Python 3.7 has already been dropped since their v9.3.0, back in September 2023. We've been testing Typer on the CI with Python 3.7 though, and this has never been an issue 🤔