pytest: Disable test_pay_routeboost for valgrind due to timeout

tests/test_pay.py

@@ -1678,6 +1678,7 @@ def test_pay_retry(node_factory, bitcoind, executor, chainparams):
 
 
 @unittest.skipIf(not DEVELOPER, "needs DEVELOPER=1 otherwise gossip takes 5 minutes!")
+@unittest.skipIf(VALGRIND, "temporarily disabled due to timeouts")
 def test_pay_routeboost(node_factory, bitcoind, compat):
     """Make sure we can use routeboost information. """
     # l1->l2->l3--private-->l4