Fix container contract action pinning

[lioneldyla]

Pins the container contract workflow actions to full commit SHAs so JDGF validation passes.

Summary by Sourcery

CI:

• Pin checkout, setup-python, and setup-uv actions in the container-contracts workflow to exact commit SHAs.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Pins all reusable GitHub Actions in the container contract workflow to explicit commit SHAs to satisfy JDGF validation and improve supply-chain integrity.

File-Level Changes

Change	Details	Files
Pin GitHub Actions used in the container-contracts workflow to specific commit SHAs instead of floating version tags.	Replaces actions/checkout@v4 with actions/checkout pinned to commit 9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 (noted as v7.0.0). Replaces actions/setup-python@v5 with actions/setup-python pinned to commit ece7cb06caefa5fff74198d8649806c4678c61a1 (noted as v6.3.0). Replaces astral-sh/setup-uv@v5 with astral-sh/setup-uv pinned to commit fac544c07dec837d0ccb6301d7b5580bf5edae39 (noted as v8.2.0).	.github/workflows/container-contracts.yml

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[sourcery-ai]

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

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