Add bootstrap changelog entry

Author: bjorn3

src/bootstrap/src/utils/change_tracker.rs

@@ -61,6 +61,11 @@ pub fn find_recent_config_change_ids(current_id: usize) -> Vec<ChangeInfo> {
 /// please ensure adding `ChangeInfo` to the end(because the list must be sorted by the merge date)
 /// of this list.
 pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
+    ChangeInfo {
+        change_id: 120348,
+        severity: ChangeSeverity::Info,
+        summary: "Added an option to select the codegen backend for individual host triples",
+    }
     ChangeInfo {
         change_id: 115898,
         severity: ChangeSeverity::Info,