bug: Running pip install -r requirements.txt failed

[Okabe-Junya]

Bug Description

During the CI workflow or in a local environment, executing pip install -r requirements fails.

result: https://github.com/masuidrive/slack-summarizer/actions/runs/6659199301

Cause

This is because there's a bug when a library, which we depend on indirectly, supports Python 3.12.

• Python 3.12 can't build wheels for aiohttp aio-libs/aiohttp#7739

How to Resolve

Fix the version of Python. Inside the CI workflow, the input to setup-python has python-version: "3.x" passed to it, which sets it to the latest stable version automatically. By explicitly setting it to 3.11.6, this issue can be resolved.

[Reference] Verification results in the fork:

• PR: hotfix: Pythonのバージョンを指定する tsukuba-websci/slack-summarizer#2
• Results: https://github.com/tsukuba-websci/slack-summarizer/actions/runs/6664844299

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