v1.20251031.0

What's Changed

• Minor improvements to MimeType by @jasnell in https://github.com/cloudflare/workerd/pull/5437
• Revert "Merge pull request #5428 from cloudflare/jasnell/replace-body… by @harrishancock in https://github.com/cloudflare/workerd/pull/5439
• Lazily generate InvocationSpanContext in IoContext by @jasnell in https://github.com/cloudflare/workerd/pull/5441
• EW-9632 Remove websocket-max-message-size-32m autogate by @harrishancock in https://github.com/cloudflare/workerd/pull/5440

Full Changelog: https://github.com/cloudflare/workerd/compare/v1.20251030.0...v1.20251031.0