Rust 1.85 (#25272)

Closes #ISSUE

Release Notes:

- N/A *or* Added/Fixed/Improved ...

---------

Co-authored-by: Anthony Eid <hello@anthonyeid.me>

crates/search/src/buffer_search.rs

@@ -1909,7 +1909,7 @@ mod tests {
         .unindent();
         let expected_query_matches_count = buffer_text
             .chars()
-            .filter(|c| c.to_ascii_lowercase() == 'a')
+            .filter(|c| c.eq_ignore_ascii_case(&'a'))
             .count();
         assert!(
             expected_query_matches_count > 1,