chore: Bump Rust version to 1.88 (#33439)

Goodies in this version:
- if-let chains 🎉
- Better compiler perf for Zed
(https://github.com/rust-lang/rust/pull/138522)

For more, see: https://releases.rs/docs/1.88.0/

Release Notes:

- N/A

---------

Co-authored-by: Junkui Zhang <364772080@qq.com>

crates/multi_buffer/src/position.rs

@@ -126,17 +126,17 @@ impl<T> Default for TypedRow<T> {
 
 impl<T> PartialOrd for TypedOffset<T> {
     fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
-        Some(self.value.cmp(&other.value))
+        Some(self.cmp(&other))
     }
 }
 impl<T> PartialOrd for TypedPoint<T> {
     fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
-        Some(self.value.cmp(&other.value))
+        Some(self.cmp(&other))
     }
 }
 impl<T> PartialOrd for TypedRow<T> {
     fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
-        Some(self.value.cmp(&other.value))
+        Some(self.cmp(&other))
     }
 }