Add change tracker entry

src/bootstrap/src/utils/change_tracker.rs

@@ -370,4 +370,9 @@ pub fn human_readable_changes(changes: &[ChangeInfo]) -> String {
         severity: ChangeSeverity::Info,
         summary: "The rust.description option has moved to build.description and rust.description is now deprecated.",
     },
+    ChangeInfo {
+        change_id: 138051,
+        severity: ChangeSeverity::Info,
+        summary: "There is now a new `gcc` config section that can be used to download GCC from CI using `gcc.download-ci-gcc = true`",
+    },
 ];