message: chore: add testnet alert keys
diff: # need 2 signatures to send alert
  signatures_threshold = 2
  public_keys = [
  + # testnet key1
  + "0x035bfb6e2e89d66d2f684fa80356611f1185863a84bc23db5df484f4b1b89cacaf",
  + # testnet key2
  + "0x02a8c9d3cef12bbcf7c5901b5801dc87db1c3f79ce4ac48a1545a1eddac17fea34",
  + # testnet key3
  + "0x03d73c8baa8cc093d1b8c85ffe280dd7cdeb0b271dc149b4c2fec4786d5de4221d",
  ]
  