Backport fix from form-data PR #571 to urllib v3 branch

As requested by @fengmk2, please backport the fix from [form-data PR #571](https://github.com/form-data/form-data/pull/571) into the urllib v3 branch.

Refer to the PR: https://github.com/node-modules/urllib/pull/547

Original comment by @fengmk2:
"@coderabbitai 提一个 issue 将 https://github.com/form-data/form-data/pull/571 修复 pick 到 urllib v3 分支"
