aeturrell/specification_curve: v0.3.9

Changes v0.3.9 (#642) @aeturrell Claude/fix type checking errors j343 v (#641) @aeturrell :package: Dependencies Bump actions/upload-artifact from 5 to 6 (#638) @dependabot[bot] Bump actions/download-artifact from 6 to 7 (#639) @dependabot[bot] Bump actions/cache from 4.3.0 to 5.0.1 (#640) @dependabot[bot] Bump codecov/codecov-action from 5.5.1 to 5.5.2 (#636) @dependabot[bot] Bump actions/setup-python from 6.0.0 to 6.1.0 (#635) @dependabot[bot] Bump actions/checkout from 5 to 6 (#634) @dependabot[bot] Bump actions/cache from 4.2.3 to 4.3.0 (#626) @dependabot[bot] Bump astral-sh/setup-uv from 6 to 7 (#629) @dependabot[bot]