Roll buildroot to prevent excessive dirtying on Xcode 14 (#37991)

Roll https://github.com/flutter/buildroot/pull/652
diff --git a/DEPS b/DEPS
index 9284d17..d492f62 100644
--- a/DEPS
+++ b/DEPS
@@ -236,7 +236,7 @@
 ]
 
 deps = {
-  'src': 'https://github.com/flutter/buildroot.git' + '@' + 'f63462fc605c94da9301d7263ce1b1f53bf4188a',
+  'src': 'https://github.com/flutter/buildroot.git' + '@' + '8747bce41d0dc6d9dc45c4d1b46d2100bb9ee688',
 
    # Fuchsia compatibility
    #