Update to discv5 bootnodes (#1849)

## Issue Addressed

We seem to have roll backed to old discv5 bootnodes with #1799 because of which fresh nodes with no cached peers cannot find any peers.

## Proposed Changes

Updates `boot_enr.yaml` to discv5.1 bootnodes.

common/eth2_testnet_config/built_in_testnet_configs/medalla/boot_enr.yaml

@@ -1,10 +1,10 @@
-- enr:-LK4QKWk9yZo258PQouLshTOEEGWVHH7GhKwpYmB5tmKE4eHeSfman0PZvM2Rpp54RWgoOagAsOfKoXgZSbiCYzERWABh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAAAAAAAAAAAAAAAAAAAAAAgmlkgnY0gmlwhDQlA5CJc2VjcDI1NmsxoQOYiWqrQtQksTEtS3qY6idxJE5wkm0t9wKqpzv2gCR21oN0Y3CCIyiDdWRwgiMo
-- enr:-LK4QEnIS-PIxxLCadJdnp83VXuJqgKvC9ZTIWaJpWqdKlUFCiup2sHxWihF9EYGlMrQLs0mq_2IyarhNq38eoaOHUoBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAAAAAAAAAAAAAAAAAAAAAAgmlkgnY0gmlwhA37LMaJc2VjcDI1NmsxoQJ7k0mKtTd_kdEq251flOjD1HKpqgMmIETDoD-Msy_O-4N0Y3CCIyiDdWRwgiMo
-- enr:-KG4QIOJRu0BBlcXJcn3lI34Ub1aBLYipbnDaxBnr2uf2q6nE1TWnKY5OAajg3eG6mHheQSfRhXLuy-a8V5rqXKSoUEChGV0aDKQGK5MywAAAAH__________4JpZIJ2NIJpcIQKAAFhiXNlY3AyNTZrMaEDESplmV9c2k73v0DjxVXJ6__2bWyP-tK28_80lf7dUhqDdGNwgiMog3VkcIIjKA
-- enr:-Ku4QLglCMIYAgHd51uFUqejD9DWGovHOseHQy7Od1SeZnHnQ3fSpE4_nbfVs8lsy8uF07ae7IgrOOUFU0NFvZp5D4wBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAYrkzLAAAAAf__________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQJxCnE6v_x2ekgY_uoE1rtwzvGy40mq9eD66XfHPBWgIIN1ZHCCD6A
-- enr:-Ku4QOzU2MY51tYFcoByfULugCu2mepfqAbB0DajbRzg8xlILLfi5Iv_Wx-ARn8SiFoZZb3yp2x05cnUDYSoDYZupjIBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAYrkzLAAAAAf__________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQLEq16KLm1vPjUKYGkHq296D60i7y209NYPUpwZPXDVgYN1ZHCCD6A
-- enr:-Ku4QOYFmi2BW_YPDew_CKdfMvsrcRY1ARA-ImtcqFl-lgoxOFbxte4PU44-1M3uRNSRM-6rVa8USGohmWwtgwalEt8Bh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAYrkzLAAAAAf__________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQKH3lxnglLqrA7L6sl5r7XFnckr3XCnlZMaBTYSdE8SHIN1ZHCCD6A
-- enr:-LK4QC3FCb7-JTNRiWAezECk_QUJc9c2IkJA1-EAmqAA5wmdbPWsAeRpnMXKRJqOYG0TE99ycB1nOb9y26mjb_UoHS4Bh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDnp11aAAAAAf__________gmlkgnY0gmlwhDMPYfCJc2VjcDI1NmsxoQOmDQryZJApMwIT-dQAbxjvxLbPzyKn9GFk5dqam4MDTYN0Y3CCIyiDdWRwgiMo
-- enr:-LK4QLvxLzt346gAPkTxohygiJvjd97lGcFeE5yXgZKtsMfEOveLE_FO2slJoHNzNF7vhwfwjt4X2vqzwGiR9gcrmDMBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDnp11aAAAAAf__________gmlkgnY0gmlwhDMPRgeJc2VjcDI1NmsxoQPjXTGx3HkaCG2neFxJmaTn5eCgbra3LY1twCeXPHChL4N0Y3CCIyiDdWRwgiMo
-- enr:-Ku4QFVactU18ogiqPPasKs3jhUm5ISszUrUMK2c6SUPbGtANXVJ2wFapsKwVEVnVKxZ7Gsr9yEc4PYF-a14ahPa1q0Bh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAYrkzLAAAAAf__________gmlkgnY0gmlwhGQbAHyJc2VjcDI1NmsxoQILF-Ya2i5yowVkQtlnZLjG0kqC4qtwmSk8ha7tKLuME4N1ZHCCIyg
-
+# lighthouse Node
+- enr:-LK4QCGFeQXjpQkgOfLHsbTjD65IOtSqV7Qo-Qdqv6SrL8lqFY7INPMMGP5uGKkVDcJkeXimSeNeypaZV3MHkcJgr9QCh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDnp11aAAAAAf__________gmlkgnY0gmlwhA37LMaJc2VjcDI1NmsxoQJ7k0mKtTd_kdEq251flOjD1HKpqgMmIETDoD-Msy_O-4N0Y3CCIyiDdWRwgiMo
+# Lighthouse node
+- enr:-LK4QCpyWmMLYwC2umMJ_g0c9VY7YOFwZyaR80_tuQNTWOzJbaR82DDhVQYqmE_0gvN6Du5jwnxzIaaNRZQlVXzfIK0Dh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDnp11aAAAAAf__________gmlkgnY0gmlwhCLR2xuJc2VjcDI1NmsxoQOYiWqrQtQksTEtS3qY6idxJE5wkm0t9wKqpzv2gCR21oN0Y3CCIyiDdWRwgiMo
+# Prysm
+- enr:-Ku4QOnVSyvzS3VbF87J8MubaRuTyfPi6B67XQg6-5eAV_uILAhn9geTTQmfqDIOcIeAxWHUUajQp6lYniAXPWncp6UBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAYrkzLAAAAAf__________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQKekYKqUtwbaJKKCct_srE5-g7tBUm68mj_jpeSb7CCqYN1ZHCCC7g
+# Prysm
+- enr:-Ku4QHWezvidY_m0dWEwERrNrqjEQWrlIx7b8K4EIxGgTrLmUxHCZPW5-t8PsS8nFxAJ8k8YacKP5zPRk5gbsTSsRTQBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAYrkzLAAAAAf__________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQMypP_ODwTuBq2v0oIdjPGCEyu9Hb_jHDbuIX_iNvBRGoN1ZHCCGWQ
+# Cat-dog
+- enr:-Ku4QJmPsyq4lmDdFebMKXk7vdt8WsLWkArYT2K8eN057oFudm2tITrZJD9sq1x92-bRmXTyAJgb2FD4ior-KHIU3KcDh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDaNQiCAAAAA___________gmlkgnY0gmlwhBK4vdCJc2VjcDI1NmsxoQMWAsR84_ETgq4-14FV2x00ptmI-YU3tdkZV9CUgYPEnIN1ZHCCI1s