Simplify port selection for Slurm/MongoDB containers

tests/integration/conftest.py

@@ -13,28 +13,11 @@
 from docker.models.containers import Container
 
 
-def _get_free_port(upper_bound=50_000):
-    """Returns a random free port, with an upper bound.
-
-    The upper bound is required as Docker does not have
-    permissions on high port numbers on some systems.
-
-    """
-    port = upper_bound + 1
-    attempts = 0
-    max_attempts = 10
-    while port > upper_bound and attempts < max_attempts:
-        sock = socket.socket()
-        sock.bind(("", 0))
-        port = sock.getsockname()[1]
-        attempts += 1
-
-    if attempts == max_attempts:
-        raise RuntimeError(
-            f"Could not find a free port to use with the provided {upper_bound=}."
-        )
-
-    return port
+def _get_free_port():
+    """Returns a random free port."""
+    sock = socket.socket()
+    sock.bind(("", 0))
+    return sock.getsockname()[1]
 
 
 def _get_random_name(length=6):