Upgrade Rust toolchain to 1.84.0 (#10533)

## Summary
Upgrade the rust toolchain to 1.84.0. This PR does not bump the MSRV.

crates/uv-python/src/installation.rs

@@ -78,12 +78,12 @@ impl PythonInstallation {
     /// Find or fetch a [`PythonInstallation`].
     ///
     /// Unlike [`PythonInstallation::find`], if the required Python is not installed it will be installed automatically.
-    pub async fn find_or_download<'a>(
+    pub async fn find_or_download(
         request: Option<&PythonRequest>,
         environments: EnvironmentPreference,
         preference: PythonPreference,
         python_downloads: PythonDownloads,
-        client_builder: &BaseClientBuilder<'a>,
+        client_builder: &BaseClientBuilder<'_>,
         cache: &Cache,
         reporter: Option<&dyn Reporter>,
         python_install_mirror: Option<&str>,
@@ -127,9 +127,9 @@ impl PythonInstallation {
     }
 
     /// Download and install the requested installation.
-    pub async fn fetch<'a>(
+    pub async fn fetch(
         request: PythonDownloadRequest,
-        client_builder: &BaseClientBuilder<'a>,
+        client_builder: &BaseClientBuilder<'_>,
         cache: &Cache,
         reporter: Option<&dyn Reporter>,
         python_install_mirror: Option<&str>,