Bump Rust to 1.91.1 (#42561)

Release Notes:

- N/A

---------

Co-authored-by: Julia Ryan <juliaryan3.14@gmail.com>

crates/text/src/selection.rs

@@ -2,11 +2,15 @@ use crate::{Anchor, BufferSnapshot, TextDimension};
 use std::cmp::Ordering;
 use std::ops::Range;
 
-#[derive(Copy, Clone, Debug, PartialEq)]
+#[derive(Default, Copy, Clone, Debug, PartialEq)]
 pub enum SelectionGoal {
+    #[default]
     None,
     HorizontalPosition(f64),
-    HorizontalRange { start: f64, end: f64 },
+    HorizontalRange {
+        start: f64,
+        end: f64,
+    },
     WrappedHorizontalPosition((u32, f32)),
 }
 
@@ -19,12 +23,6 @@ pub struct Selection<T> {
     pub goal: SelectionGoal,
 }
 
-impl Default for SelectionGoal {
-    fn default() -> Self {
-        Self::None
-    }
-}
-
 impl<T: Clone> Selection<T> {
     /// A place where the selection had stopped at.
     pub fn head(&self) -> T {