add a change entry for new default on build.vendor

Signed-off-by: onur-ozkan <work@onurozkan.dev>

src/bootstrap/src/utils/change_tracker.rs

@@ -310,4 +310,9 @@ pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
         severity: ChangeSeverity::Warning,
         summary: "Revert `rust.download-rustc` global default to `false` and only use `rust.download-rustc = \"if-unchanged\"` default for library and tools profile. As alt CI rustc is built without debug assertions, `rust.debug-assertions = true` will now inhibit downloading CI rustc.",
     },
+    ChangeInfo {
+        change_id: 133853,
+        severity: ChangeSeverity::Info,
+        summary: "`build.vendor` is now enabled by default for dist/tarball sources when 'vendor' directory and '.cargo/config.toml' file are present.",
+    },
 ];