fix bzlmod_unixy import

Author: rickeylev

tests/whl_with_build_files/BUILD.bazel

@@ -1,9 +1,9 @@
 load("//python:py_test.bzl", "py_test")
-load("//tests/support:support.bzl", "BZLMOD_UNIXY")
+load("//tests/support:support.bzl", "SUPPORTS_BZLMOD_UNIXY")
 
 py_test(
     name = "verify_files_test",
     srcs = ["verify_files_test.py"],
-    target_compatible_with = BZLMOD_UNIXY,
+    target_compatible_with = SUPPORTS_BZLMOD_UNIXY,
     deps = ["@somepkg_with_build_files//:pkg"],
 )