glamsterdam-devnet-6: sync validator_names.yaml

Author: barnabasbusa

network-configs/devnet-6/metadata/validator_names.yaml

@@ -6,3 +6,4 @@
 - 4657-5008: { src: "main-mnemonic", from: 4648, to: 4999 }
 - 5010-5875: { src: "main-mnemonic", from: 5000, to: 5865 }
 - 5876-8209: { src: "main-mnemonic", from: 5866, to: 8199 }
+- 8210-8401: { src: "main-mnemonic", from: 8200, to: 8391 }