Rollup merge of #73354 - XAMPPRocky:relnotes-1.45.0, r=Mark-Simulacrum
Rollup merge of #73354 - XAMPPRocky:relnotes-1.45.0, r=Mark-Simulacrum

Update RELEASES.md for 1.45.0

### [Rendered](https://github.com/XAMPPRocky/rust/blob/relnotes-1.45.0/RELEASES.md)

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

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