Update dependency buildifier_prebuilt to v6.4.0 (#172)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| buildifier_prebuilt | bazel_dep | minor | `6.3.3` -> `6.4.0` |

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MODULE.bazel

@@ -9,7 +9,7 @@ module(
 # =========================================
 
 bazel_dep(name = "bazel_skylib", version = "1.5.0")
-bazel_dep(name = "buildifier_prebuilt", version = "6.3.3")
+bazel_dep(name = "buildifier_prebuilt", version = "6.4.0")
 bazel_dep(name = "platforms", version = "0.0.8")
 bazel_dep(name = "rules_jvm_external", version = "5.3")
 bazel_dep(name = "rules_proto", version = "5.3.0-21.7")