DEV: pinned gh actions by hash

[GavinHuttley]

Summary by Sourcery

CI:

• Update checkout, setup-uv, artifact upload/download, Coveralls, and add-and-commit actions in workflows to hash-pinned versions.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR pins all GitHub Actions used in the CI workflows to specific commit SHAs, documenting their corresponding versions in comments, to improve supply-chain security and reproducibility.

File-Level Changes

Change	Details	Files
Pin shared GitHub Actions in the release workflow to specific commit SHAs and annotate with versions.	Replace actions/checkout@v6 with a commit SHA reference and comment its tagged version. Replace astral-sh/setup-uv@v7 with a commit SHA reference and comment its tagged version. Replace actions/upload-artifact@v7 with a commit SHA reference and comment its tagged version. Replace actions/download-artifact@v8 with a commit SHA reference and comment its tagged version in both relevant jobs.	.github/workflows/release.yml
Pin GitHub Actions in the testing_develop workflow to specific commit SHAs and annotate with versions.	Replace actions/checkout@v6 with a commit SHA reference and comment its tagged version in both jobs. Replace astral-sh/setup-uv@v7 with a commit SHA reference and comment its tagged version in both jobs. Replace coverallsapp/github-action@v2 with a commit SHA reference and comment its tagged version in both Coveralls steps.	.github/workflows/testing_develop.yml
Pin GitHub Actions in the linters workflow to specific commit SHAs and annotate with versions.	Replace actions/checkout@v6 with a commit SHA reference and comment its tagged version. Replace astral-sh/setup-uv@v7 with a commit SHA reference and comment its tagged version. Replace EndBug/add-and-commit@v10 with a commit SHA reference and comment its tagged version.	.github/workflows/linters.yml

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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[sourcery-ai]

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