ci: pin ruff packages

[mislavivanda]

Summary by cubic

Pins ruff and locks lint rules to stabilize CI. Previously we allowed any ruff and relied on its evolving default rules; now we require ruff>=0.15,<0.17 and explicitly select E4/E7/E9/F to prevent unexpected failures from new defaults.

Review notes

• Updates the dev extras in packages/adk-plugin and packages/pydantic-ai-daytona to ruff>=0.15,<0.17.
• Adds [tool.ruff.lint].select = ["E4", "E7", "E9", "F"] in both pyproject.toml files.
• Action: If you have ruff>=0.17 locally, reinstall dev deps to align with the pinned range.

^{Written for commit 1c4d7a2. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}