Release v6.7.2

[AurevoirXavier]

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RuntimeVersion {
    spec_name: "Darwinia Koi",
    impl_name: "DarwiniaOfficialRust",
    authoring_version: 0,
-   spec_version: 6710,
+   spec_version: 6720,
    impl_version: 0,
    transaction_version: 0,
    state_version: 0,
}

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