Noted the previous forced default in the change tracker

Author: xSetech

src/bootstrap/src/utils/change_tracker.rs

@@ -579,6 +579,6 @@ pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
     ChangeInfo {
         change_id: 148636,
         severity: ChangeSeverity::Info,
-        summary: "The `build.python` option is now respected on macOS (previously ignored).",
+        summary: "The `build.python` option is now respected on macOS (previously ignored and forced to be /usr/bin/python3).",
     },
 ];