Update buildifier to 6.4.0 (#47)

MODULE.bazel

diff --git a/MODULE.bazel b/MODULE.bazel
index 3fb6c5e..228fdfc 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -8,7 +8,7 @@
 
 bazel_dep(name = "bazel_features", version = "1.9.0")
 bazel_dep(name = "bazel_skylib", version = "1.5.0")
-bazel_dep(name = "buildifier_prebuilt", version = "6.1.2")
+bazel_dep(name = "buildifier_prebuilt", version = "6.4.0")
 bazel_dep(name = "platforms", version = "0.0.8")
 
 # ensure toolchains get registered