Use #![register_tool] instead of #![register_attr]

CC https://github.com/rust-lang/rust/issues/66079

components/script/dom/servoparser/async_html.rs

@@ -196,7 +196,7 @@ fn create_buffer_queue(mut buffers: VecDeque<SendTendril<UTF8>>) -> BufferQueue
 //   |_____________|                         |_______________|
 //
 #[derive(JSTraceable, MallocSizeOf)]
-#[must_root]
+#[unrooted_must_root_lint::must_root]
 pub struct Tokenizer {
     document: Dom<Document>,
     #[ignore_malloc_size_of = "Defined in std"]

components/script/dom/servoparser/html.rs

@@ -30,7 +30,7 @@ use servo_url::ServoUrl;
 use std::io;
 
 #[derive(JSTraceable, MallocSizeOf)]
-#[must_root]
+#[unrooted_must_root_lint::must_root]
 pub struct Tokenizer {
     #[ignore_malloc_size_of = "Defined in html5ever"]
     inner: HtmlTokenizer<TreeBuilder<Dom<Node>, Sink>>,

components/script/dom/servoparser/mod.rs

@@ -626,7 +626,7 @@ enum ParserKind {
 }
 
 #[derive(JSTraceable, MallocSizeOf)]
-#[must_root]
+#[unrooted_must_root_lint::must_root]
 enum Tokenizer {
     Html(self::html::Tokenizer),
     AsyncHtml(self::async_html::Tokenizer),
@@ -945,7 +945,7 @@ fn insert(parent: &Node, reference_child: Option<&Node>, child: NodeOrText<Dom<N
 }
 
 #[derive(JSTraceable, MallocSizeOf)]
-#[must_root]
+#[unrooted_must_root_lint::must_root]
 pub struct Sink {
     base_url: ServoUrl,
     document: Dom<Document>,

components/script/dom/servoparser/prefetch.rs

@@ -32,7 +32,7 @@ use servo_url::ImmutableOrigin;
 use servo_url::ServoUrl;
 
 #[derive(JSTraceable, MallocSizeOf)]
-#[must_root]
+#[unrooted_must_root_lint::must_root]
 pub struct Tokenizer {
     #[ignore_malloc_size_of = "Defined in html5ever"]
     inner: HtmlTokenizer<PrefetchSink>,

components/script/dom/servoparser/xml.rs

@@ -17,7 +17,7 @@ use xml5ever::tokenizer::XmlTokenizer;
 use xml5ever::tree_builder::{Tracer as XmlTracer, XmlTreeBuilder};
 
 #[derive(JSTraceable, MallocSizeOf)]
-#[must_root]
+#[unrooted_must_root_lint::must_root]
 pub struct Tokenizer {
     #[ignore_malloc_size_of = "Defined in xml5ever"]
     inner: XmlTokenizer<XmlTreeBuilder<Dom<Node>, Sink>>,