fix: escape backslash in test

test/test_debug/test_proxy-debug-flag.py

@@ -9,4 +9,4 @@ def test_debug_info_is_present_in_nginx_generated_conf(docker_compose, nginxprox
            re.search(r"# Exposed ports: \[\{\d+\.\d+\.\d+\.\d+\s+83\s+tcp \} \{\d+\.\d+\.\d+\.\d+\s+82\s+tcp \}\]", conf)
     assert "# Default virtual port: 80" in conf
     assert "# VIRTUAL_PORT: 82" in conf
-    assert conf.count("# /!\ Virtual port not exposed") == 1
+    assert conf.count("# /!\\ Virtual port not exposed") == 1