Rollup merge of #75290 - rust-lang:min_const_generics-version, r=jonas-schievink
Rollup merge of #75290 - rust-lang:min_const_generics-version, r=jonas-schievink

fix `min_const_generics` version

https://github.com/rust-lang/rust/pull/74877#discussion_r467451813

> This should be 1.47.0

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