Removes I/O from linky tests (#31299)

tests/components/linky/conftest.py

@@ -0,0 +1,11 @@
+"""Linky generic test utils."""
+from unittest.mock import patch
+
+import pytest
+
+
+@pytest.fixture(autouse=True)
+def patch_fakeuseragent():
+    """Stub out fake useragent dep that makes requests."""
+    with patch("pylinky.client.UserAgent", return_value="Test Browser"):
+        yield