chore: bump e2b

[jakubno]

bump e2b package

[cursor]

PR Summary

Low Risk
Lockfile and version constraint updates only; no local code paths changed.

Overview
Bumps the underlying e2b dependency for the JavaScript (^2.28.0) and Python (^2.26.0) code-interpreter packages and refreshes pnpm-lock.yaml and poetry.lock. A changeset records minor releases for @e2b/code-interpreter and @e2b/code-interpreter-python, noting upstream support for API-only custom headers. No application source in this repo is modified; behavior changes come from the upgraded e2b SDK.

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