Fix COM812 false positive in string subscript (#4493)

crates/ruff/resources/test/fixtures/flake8_commas/COM81.py

@@ -631,3 +631,11 @@ result = function(
 the_first_one = next(
     (i for i in range(10) if i // 2 == 0)  # COM812 fix should include the final bracket
 )
+
+foo = namedtuple(
+    name="foo",
+    status="bar",
+    message="sfdsdfsdgs fsdfsdf output!dsfdfsdjkg  ghfskdjghkdssd sd fsdf  s\n"[
+        :20
+    ],
+)

crates/ruff/src/rules/flake8_commas/rules.rs

@@ -27,6 +27,7 @@ enum TokenType {
     Def,
     Lambda,
     Colon,
+    String,
 }
 
 /// Simplified token specialized for the task.
@@ -55,6 +56,7 @@ impl<'tok> Token<'tok> {
             // Import treated like a function.
             Tok::Import => TokenType::Named,
             Tok::Name { .. } => TokenType::Named,
+            Tok::String { .. } => TokenType::String,
             Tok::Comma => TokenType::Comma,
             Tok::Lpar => TokenType::OpeningBracket,
             Tok::Lsqb => TokenType::OpeningSquareBracket,
@@ -265,7 +267,7 @@ pub(crate) fn trailing_commas(
                 }
             },
             TokenType::OpeningSquareBracket => match prev.type_ {
-                TokenType::ClosingBracket | TokenType::Named => {
+                TokenType::ClosingBracket | TokenType::Named | TokenType::String => {
                     stack.push(Context::new(ContextType::Subscript));
                 }
                 _ => {

crates/ruff/src/rules/flake8_commas/snapshots/ruff__rules__flake8_commas__tests__COM81.py.snap

@@ -936,5 +936,7 @@ COM81.py:632:42: COM812 [*] Trailing comma missing
 632     |-    (i for i in range(10) if i // 2 == 0)  # COM812 fix should include the final bracket
     632 |+    (i for i in range(10) if i // 2 == 0),  # COM812 fix should include the final bracket
 633 633 | )
+634 634 | 
+635 635 | foo = namedtuple(