chore(deps): update dependency buildifier_darwin_arm64 to v6.4.0

Author: renovate[bot]

fetch_deps.bzl

@@ -189,8 +189,8 @@ def fetch_direct_dependencies():
     http_file(
         name = "buildifier_darwin_arm64",
         executable = True,
-        sha256 = "21fa0d48ef0b7251eb6e3521cbe25d1e52404763cd2a43aa29f69b5380559dd1",
-        urls = ["https://github.com/bazelbuild/buildtools/releases/download/6.0.0/buildifier-darwin-arm64"],
+        sha256 = "fa07ba0d20165917ca4cc7609f9b19a8a4392898148b7babdf6bb2a7dd963f05",
+        urls = ["https://github.com/bazelbuild/buildtools/releases/download/v6.4.0/buildifier-darwin-arm64"],
     )
 
     http_file(