Clean up some unused dependencies (#32600)

Cargo.lock

@@ -943,7 +943,6 @@ dependencies = [
  "keyboard-types",
  "log",
  "media",
- "metrics",
  "net",
  "net_traits",
  "parking_lot",
@@ -3350,7 +3349,6 @@ dependencies = [
  "base",
  "bitflags 2.5.0",
  "canvas_traits",
- "cssparser",
  "data-url",
  "embedder_traits",
  "euclid",
@@ -3434,7 +3432,6 @@ version = "0.0.1"
 dependencies = [
  "app_units",
  "base",
- "crossbeam-channel",
  "embedder_traits",
  "euclid",
  "fnv",
@@ -5179,7 +5176,6 @@ dependencies = [
  "script_traits",
  "selectors",
  "serde",
- "serde_bytes",
  "serde_json",
  "servo-media",
  "servo_allocator",