Use version of markup5ever with web_atoms crate (#36542)

Upgrades `markup5ever` and fixes "unnecessary import" lints.

See https://github.com/servo/html5ever/pull/599
And https://github.com/servo/stylo/pull/173

Signed-off-by: Nico Burns <nico@nicoburns.com>

Cargo.lock

@@ -4451,16 +4451,13 @@ dependencies = [
 
 [[package]]
 name = "markup5ever"
-version = "0.16.0"
+version = "0.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ba2225413ed418d540a2c8247d794f4b0527a021da36f69c05344d716dc44c1"
+checksum = "d0a8096766c229e8c88a3900c9b44b7e06aa7f7343cc229158c3e58ef8f9973a"
 dependencies = [
  "log",
- "phf",
- "phf_codegen",
- "string_cache",
- "string_cache_codegen",
  "tendril",
+ "web_atoms",
 ]
 
 [[package]]
@@ -8404,6 +8401,18 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "web_atoms"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "954c5a41f2bcb7314344079d0891505458cc2f4b422bdea1d5bfbe6d1a04903b"
+dependencies = [
+ "phf",
+ "phf_codegen",
+ "string_cache",
+ "string_cache_codegen",
+]
+
 [[package]]
 name = "webdriver"
 version = "0.51.0"