client: Remove unused fs dependency (#18324)

CI bot notified me about that in
https://github.com/zed-industries/zed/pull/18323


Release Notes:

- N/A

Cargo.lock

@@ -2409,7 +2409,6 @@ dependencies = [
  "cocoa 0.26.0",
  "collections",
  "feature_flags",
- "fs",
  "futures 0.3.30",
  "gpui",
  "http_client",

crates/client/Cargo.toml

@@ -23,7 +23,6 @@ chrono = { workspace = true, features = ["serde"] }
 clock.workspace = true
 collections.workspace = true
 feature_flags.workspace = true
-fs.workspace = true
 futures.workspace = true
 gpui.workspace = true
 http_client.workspace = true