release: 4.0.1

[stainless-app[bot]]

Automated Release PR

4.0.1 (2025-11-20)

Full Changelog: v4.0.0...v4.0.1

Bug Fixes

• better thread safety via early initializing SSL store during HTTP client creation (2bc0835)

Chores

• bump dependency version and update sorbet types (8d89fb2)
• client: send user-agent header (796027d)
• explicitly require "base64" gem (1b4181d)

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