ci: pin GitHub Actions to commit SHAs (1)

[mirkosalvato1-ctrl]

Why

Mutable Action tags (@v4, @main) can be retagged, which is a supply-chain risk.
This PR pins third-party Actions to full commit SHAs while keeping the tag in a comment.
Official actions/* tags are left unchanged (common maintainer preference).

Pins

• codecov/codecov-action@v7 -> fb8b3582c8e4

Reference: GitHub docs on using third-party actions securely.

Summary by Sourcery

CI:

• Update the Codecov upload step in the Python package workflow to reference a fixed commit SHA instead of a mutable version tag.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Pins the Codecov GitHub Action in the Python package CI workflow to a specific commit SHA for improved supply‑chain security, while retaining the original version tag in a comment.

File-Level Changes

Change	Details	Files
Pin Codecov upload step in CI workflow to an immutable commit SHA instead of a mutable version tag.	Replace use of the Codecov action version tag with a full commit SHA to prevent silent upstream changes. Add an inline comment indicating that the pinned SHA corresponds to Codecov action v7. Leave all other workflow steps and configuration unchanged.	.github/workflows/pythonpackage.yml

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sourcery-ai]

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

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