Rollup merge of #79815 - XAMPPRocky:relnotes-1.49.0, r=Mark-Simulacrum
Rollup merge of #79815 - XAMPPRocky:relnotes-1.49.0, r=Mark-Simulacrum

Update RELEASES.md for 1.49.0

### [Rendered](https://github.com/XAMPPRocky/rust/tree/relnotes-1.49.0/RELEASES.md)

r? ``@Mark-Simulacrum``
cc ``@rust-lang/release``

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