Remove unneeded dependency.

Also sort them.

Author: nnethercote

Cargo.lock

@@ -4416,7 +4416,6 @@ dependencies = [
  "rustc_hir",
  "rustc_interface",
  "rustc_middle",
- "rustc_session",
  "rustc_span",
  "rustc_target",
  "stable_mir",

compiler/rustc_smir/Cargo.toml

@@ -4,14 +4,13 @@ version = "0.0.0"
 edition = "2021"
 
 [dependencies]
+rustc_driver = { path = "../rustc_driver" }
 rustc_hir = { path = "../rustc_hir" }
+rustc_interface = { path = "../rustc_interface" }
 rustc_middle = { path = "../rustc_middle" }
 rustc_span = { path = "../rustc_span" }
 rustc_target = { path = "../rustc_target" }
-rustc_driver = { path = "../rustc_driver" }
-rustc_interface = { path = "../rustc_interface" }
-rustc_session = {path = "../rustc_session" }
-tracing = "0.1"
 stable_mir = {path = "../stable_mir" }
+tracing = "0.1"
 
 [features]