chore(ci): upgrade setup-python to v6 and setup-uv to v7

[macalbert]

Summary

Upgrades GitHub Actions dependencies to fix Node.js 20 deprecation warnings
and adds live coverage badges from GitHub Pages to the root README.

Changes

CI workflows

• actions/setup-python v5 → v6 (Node.js 24 compatible)
• astral-sh/setup-uv v6 → v7 (latest available major tag; v8.0.0 release exists but floating v8 tag not yet published)
• Affected: publish-pypi.yml, tests-python-sdk.yml, coverage-report.yml

README

• Replaced static shields.io coverage badge with live SVG from GitHub Pages
• Added per-stack badges (Core, .NET, Python, IaC) linking to individual reports

Testing

• No logic changes — workflow action version bumps only
• README badge URLs verified (200 OK)

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/upgrade-ci-actions

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[Copilot]

Pull request overview

This PR modernizes CI workflow dependencies to avoid GitHub Actions runtime deprecation warnings (Node.js 20 → newer runtime compatibility) and updates the repository README to use live coverage badges published via GitHub Pages.

Changes:

• Upgraded actions/setup-python from v5 to v6 across Python-related workflows.
• Upgraded astral-sh/setup-uv from v6 to v8 across Python-related workflows.
• Replaced the static coverage badge in README.md with live SVG badges (combined + per-stack) hosted on GitHub Pages.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
README.md	Switches to live GitHub Pages coverage badges (combined + per-stack).
.github/workflows/tests-python-sdk.yml	Bumps setup-python to v6 and setup-uv to v8 for Python SDK tests.
.github/workflows/publish-pypi.yml	Bumps setup-python to v6 and setup-uv to v8 for the PyPI publish workflow.
.github/workflows/coverage-report.yml	Bumps setup-python to v6 and setup-uv to v8 for the Python coverage job.

[Copilot]

Pull request overview

Updates CI workflow action dependencies to address Node.js deprecation warnings in GitHub Actions, and refreshes the root README to show live, per-stack coverage badges published via GitHub Pages.

Changes:

• Bump actions/setup-python from v5 to v6 in Python-related workflows.
• Bump astral-sh/setup-uv from v6 to v7 in the same workflows (note: PR metadata says v8).
• Replace the static README coverage badge with live combined + per-stack badges linking to GitHub Pages reports.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
README.md	Switches coverage badges to live SVGs from GitHub Pages, adds per-stack links.
.github/workflows/tests-python-sdk.yml	Updates setup-python to v6 and setup-uv to v7 for Python SDK CI.
.github/workflows/publish-pypi.yml	Updates setup-python to v6 and setup-uv to v7 for PyPI publish workflow.
.github/workflows/coverage-report.yml	Updates setup-python to v6 and setup-uv to v7 for coverage generation workflow.