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>

crates/task/src/vscode_debug_format.rs

@@ -6,13 +6,6 @@ use crate::{
     DebugScenario, DebugTaskFile, EnvVariableReplacer, TcpArgumentsTemplate, VariableName,
 };
 
-#[derive(Clone, Debug, Deserialize, PartialEq)]
-#[serde(rename_all = "camelCase")]
-enum Request {
-    Launch,
-    Attach,
-}
-
 // TODO support preLaunchTask linkage with other tasks
 #[derive(Clone, Debug, Deserialize, PartialEq)]
 #[serde(rename_all = "camelCase")]