[BUG] Regression since 0.6.6+, quoted cookie values cause IIS server to crash

[megri]

I've noticed a regression since 0.6.5 where the receiving host simply crashes with a 500 error.

The change was introduced in https://github.com/com-lihaoyi/requests-scala/commit/dabd72858c3dde1762543ec9c215a2d874355e26. From what I've been able to read, there's not really any benefit to quoting a cookie value, and older servers seem to outright reject it or crash.