Trivial CI updates

[samaloney]

PR Description

Update the devdeps test to actually use latest version of core dependencies and add docs back to sdist (manifest.ini)

AI Assistance Disclosure

AI tools were used for:

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding
• No AI tools were used

Regardless of AI use, the human contributor remains fully responsible for correctness, design choices, licensing compatibility, and long-term maintainability.