Capture pythonx init output in tests

test/livebook/runtime/evaluator_test.exs

@@ -11,13 +11,18 @@ defmodule Livebook.Runtime.EvaluatorTest do
     # code evaluation. Testing pyproject.toml evaluation is tricky
     # because it requires a separate VM, so we only rely on the LV
     # integration tests.
-    Pythonx.uv_init("""
-    [project]
-    name = "project"
-    version = "0.0.0"
-    requires-python = "==3.13.*"
-    dependencies = []
-    """)
+
+    ExUnit.CaptureIO.capture_io(fn ->
+      Pythonx.uv_init("""
+      [project]
+      name = "project"
+      version = "0.0.0"
+      requires-python = "==3.13.*"
+      dependencies = []
+      """)
+    end)
+
+    :ok
   end
 
   setup ctx do