piping to wrangler secret put is broken in 1.9.1

[EverlastingBugstopper]

🐛 Bug Report

Environment

• operating system:
• output of rustc -V:
• output of node -v:
• output of wrangler -V:
• contents of wrangler.toml

Steps to reproduce

install wrangler 1.9.1, cat somefile.txt | wrangler secret put INPUT

What did you expect to see?

🌀  Creating the secret for script name secret-test
✨  Success! Uploaded secret INPUT.

What did you see instead?

Error: Your secret cannot be empty.