Rollup merge of #66698 - petrochenkov:tidywarn, r=Mark-Simulacrum
Rollup merge of #66698 - petrochenkov:tidywarn, r=Mark-Simulacrum

tidy: Remove unused import

It produces annoying warnings on `x.py` runs.

graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust