contrib: Add a few TorV3 seed nodes

contrib/seeds/nodes_main.txt

@@ -1162,3 +1162,29 @@ zuytrfevzjcpizli.onion:8333
 zvq6dpt3i2ofdp3g.onion:8333
 zwwm6ga7u2hqe2sd.onion:8333
 zyqb4lenfspntj5m.onion:8333
+
+# manually added 2021-03 for minimal torv3 bootstrap support
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