Added Docker image for older ARMv7 architecture support because of glibc issues

[jakub-kocka]

Description

• New Dockerfile and runner for older ARMv7 OSes
• Updated pre-commit hooks and froze mypy because of the Python requirements

I have dropped Python 3.14 support for the legacy ARMv7 runner because it would bring more implementation issues, and I believe the time period between these old OSes and Python 3.14 is significant enough not to support it.

Related

Internal related tracker: IDFCI-8006

Testing

Action run: https://github.com/espressif/idf-python-wheels/actions/runs/20991228759

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Checklist

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• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
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• Git history is clean — commits are squashed to the minimum necessary.

[github-actions]

	Messages
📖	You might consider squashing your 4 commits (simplifying branch history).

👋 Hello jakub-kocka, we appreciate your contribution to this project!

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[peterdragun]

LGTM, this fixes the issue for us in the esptool. Thank you!

[dobairoland]

LGTM.

[jakub-kocka]

I have removed the Docker files and updated the README.md. Are you OK with this approach, @dobairoland?