[dajiaohuang]

Summary

• Update all 18 documented dependency-version occurrences across the eight READMEs identified in README dependency versions diverge from sample manifests #263 to match their colocated manifests.
• The previously related PR chore: upgrade sample dependencies #240 was closed as stale; the current main manifests still contain the cited versions.

Fixes #263

Validation

• Verified the changed README pins against current pyproject.toml / requirements.txt values; the cited stale versions are absent from the affected files.
• git diff --check passed.
• Ran the repository pre-commit suite; gitleaks passed. The configured markdownlint hook globs omit the python/ prefix, so that hook did not validate these README paths.
• Direct markdownlint-cli2@0.18.1 on the eight files reported 57 existing findings (including existing required-header/list/spacing findings); none are on changed lines. No package/runtime tests run for this documentation-only change.