bpo-28806: Continue work: improve the netrc library (GH-26330)

Continue with the improvement of the library netrc

Original work and report Xiang Zhang <angwerzx@126.com>

* 📜🤖 Added by blurb_it.

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>