Clean up many small dependencies (part 3) (#8425)

Follow-up to #8353

Release Notes:
- N/A

crates/project_panel/Cargo.toml

@@ -14,10 +14,8 @@ anyhow.workspace = true
 collections.workspace = true
 db.workspace = true
 editor.workspace = true
-futures.workspace = true
 gpui.workspace = true
 menu.workspace = true
-postage.workspace = true
 pretty_assertions.workspace = true
 project.workspace = true
 schemars.workspace = true
@@ -26,7 +24,6 @@ serde.workspace = true
 serde_derive.workspace = true
 serde_json.workspace = true
 settings.workspace = true
-smallvec.workspace = true
 theme.workspace = true
 ui.workspace = true
 unicase = "2.6"