Rollup merge of #39624 - brson:relnotes-master, r=alexcrichton
Rollup merge of #39624 - brson:relnotes-master, r=alexcrichton

Bump stable release date

cc https://github.com/rust-lang/rust/pull/39623

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