Update http crate name (#15041)

Release Notes:

- N/A

crates/collab/src/rpc.rs

@@ -42,7 +42,7 @@ use futures::{
     stream::FuturesUnordered,
     FutureExt, SinkExt, StreamExt, TryStreamExt,
 };
-use http::IsahcHttpClient;
+use http_client::IsahcHttpClient;
 use prometheus::{register_int_gauge, IntGauge};
 use rpc::{
     proto::{

crates/collab/src/tests/test_server.rs

@@ -19,7 +19,7 @@ use fs::FakeFs;
 use futures::{channel::oneshot, StreamExt as _};
 use git::GitHostingProviderRegistry;
 use gpui::{BackgroundExecutor, Context, Model, Task, TestAppContext, View, VisualTestContext};
-use http::FakeHttpClient;
+use http_client::FakeHttpClient;
 use language::LanguageRegistry;
 use node_runtime::FakeNodeRuntime;
 use notifications::NotificationStore;