test: add type annotation for ADDRS in p2p_addrv2_relay

Required to avoid unhappy python linter[1] result. Have to use annotation
instead of re-aligning with upstream (where ADDRS is populated in the
global state) due to reliance on `self.mocktime`, without which, the test
fails[2]

[1] - https://gitlab.com/dashpay/dash/-/jobs/6594035886
[2] - https://gitlab.com/dashpay/dash/-/jobs/6597322548

test/functional/p2p_addrv2_relay.py

@@ -6,6 +6,8 @@
 Test addrv2 relay
 """
 
+from typing import List
+
 from test_framework.messages import (
     CAddress,
     msg_addrv2,
@@ -17,7 +19,7 @@
 
 I2P_ADDR = "c4gfnttsuwqomiygupdqqqyy5y5emnk5c73hrfvatri67prd7vyq.b32.i2p"
 
-ADDRS = []
+ADDRS: List[CAddress] = []
 
 
 class AddrReceiver(P2PInterface):