rollback tempfile, drop rustvers requirement

packages/cli/src/build/request.rs

@@ -960,10 +960,11 @@ impl BuildRequest {
             }
         }
 
+        #[allow(deprecated)]
         let session_cache_dir = args
             .session_cache_dir
             .clone()
-            .unwrap_or_else(|| TempDir::new().unwrap().keep());
+            .unwrap_or_else(|| TempDir::new().unwrap().into_path());
 
         let extra_rustc_args = shell_words::split(&args.rustc_args.clone().unwrap_or_default())
             .context("Failed to parse rustc args")?;