fix(ci): update sobelow action to fix elixir version compatibility

[SerhiiFesenko]

Summary

• Updates sobelow/action to latest commit with Elixir 1.18.3 support
• Fixes GitHub Actions crash due to Elixir version incompatibility

Summary by Sourcery

Update the Sobelow GitHub Action to a newer commit to restore compatibility with Elixir 1.18.3

Bug Fixes:

• Fix CI workflow crash caused by Elixir version incompatibility

CI:

• Bump sobelow/action to commit a9bf221c4eef7e7a4486fa1f06257511c9780b46

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the CI workflow to pin the sobelow/action to a commit that supports Elixir 1.18.3, resolving crashes caused by version incompatibility.

File-Level Changes

Change	Details	Files
Pin sobelow GitHub Action to a commit supporting Elixir 1.18.3	Replace uses reference from sobelow/action@1afd6d2 to @a9bf221	.github/workflows/sobelow.yml

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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