fix(tests): skip proxy for localhost in Windows environments

Set NO_PROXY environment variable to 127.0.0.1 to prevent tests from
failing on Windows systems with a proxy enabled.

Closes #1477

Signed-off-by: cxhello <caixiaohuichn@gmail.com>

Author: cxhello

tests/conftest.py

@@ -1,5 +1,9 @@
+import os
+
 import pytest
 
+os.environ["NO_PROXY"] = "127.0.0.1"
+
 
 @pytest.fixture
 def anyio_backend():