Move types-requests to dev dependencies

[PeterTianbuhan]

Summary

Move types-requests out of the published runtime dependency list and into the dev dependency group. Update uv.lock so openai-agents no longer advertises types-requests in requires-dist, while local development still installs it for type-checking.

This addresses #3507: types-requests is a stub package and does not affect runtime behavior. Keeping it in runtime dependencies makes regular installs pull an unnecessary package, and recent requests releases include inline type hints.

Test plan

• uv lock --check
• uv tree --no-dev --package openai-agents confirmed no types-requests in the non-dev install tree
• git diff --check
• make sync
• bash .agents/skills/code-change-verification/scripts/run.sh

Issue number

Closes #3507

Checks

• I've added new tests (not relevant: dependency metadata only)
• I've added/updated the relevant documentation (not relevant: dependency metadata only)
• I've run make lint and make format
• I've made sure tests pass

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Moves types-requests from runtime dependencies to dev dependencies, since type stubs are only needed during development/type-checking.

Changes:

• Removed types-requests from the main dependencies list.
• Added types-requests>=2.0, <3 to the dev dependencies list.

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