Bump Rust to 1.90 (#38436)

Release Notes:

- N/A

---------

Co-authored-by: Nia Espera <nia@zed.dev>
Co-authored-by: Julia Ryan <juliaryan3.14@gmail.com>

rust-toolchain.toml

@@ -1,5 +1,5 @@
 [toolchain]
-channel = "1.89"
+channel = "1.90"
 profile = "minimal"
 components = [ "rustfmt", "clippy" ]
 targets = [