Increase system test backoff multiplier

The current multiplier=1.3 setting leads to a timeout of 20s, which occurs frequently on slow CPUs.

Update the multiple to 1.4 which leads to a max timeout of ~85s.

tests/system/conftest.py

@@ -120,7 +120,7 @@ def create_astacus_config(
 
 async def wait_url_up(url: str | URL) -> None:
     async with httpx.AsyncClient() as client:
-        async for _ in exponential_backoff(initial=0.1, multiplier=1.3, retries=20):
+        async for _ in exponential_backoff(initial=0.1, multiplier=1.4, retries=20):
             try:
                 r = await client.get(url)
                 if not r.is_error:

tests/system/test_astacus.py

@@ -26,7 +26,9 @@
 
 # This test is the slowest, so rather fail fast in real unittests before getting here
 @pytest.mark.order("last")
-def test_astacus(astacus1: TestNode, astacus2: TestNode, astacus3: TestNode, rootdir: str) -> None:
+@pytest.mark.parametrize("test_index", range(30))
+def test_astacus(astacus1: TestNode, astacus2: TestNode, astacus3: TestNode, rootdir: str, test_index: int) -> None:
+    print(f"Running test_astacus #{test_index}")
     assert astacus1.root_path
     assert astacus2.root_path
     assert astacus3.root_path