fix(ci): address lint and coverage failures

[somethingwithproof]

Summary

• replace descending sort_by closures with sort_by_key + Reverse for the current Clippy lint
• install pkg-config and libssl-dev before cargo-tarpaulin on the self-hosted Linux coverage runner
• fix the release workflow concurrency expression so GitHub evaluates github.ref

Validation

• cargo fmt --all -- --check
• cargo clippy -- -D warnings
• cargo test --verbose
• parsed touched workflow YAML files with Python YAML loader
• pre-commit hooks passed during commit

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: 35da8173-182c-4995-9ad3-c8fef66f2763

📥 Commits

Reviewing files that changed from the base of the PR and between 1b42172 and 2560e2c.

📒 Files selected for processing (3)

• .github/workflows/ci.yml
• .github/workflows/release.yml
• src/stats.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ci-lint-and-coverage

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[github-actions]

🎉 This PR is included in version 1.0.0 🎉

The release is available on GitHub release

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