test: Bump MAX_NODES to 12

test/functional/test_framework/util.py

@@ -228,7 +228,7 @@ def wait_until(predicate, *, attempts=float('inf'), timeout=float('inf'), lock=N
 ############################################
 
 # The maximum number of nodes a single test can spawn
-MAX_NODES = 8
+MAX_NODES = 12
 # Don't assign rpc or p2p ports lower than this
 PORT_MIN = 11000
 # The number of ports to "reserve" for p2p and rpc, each