Revert "test(fastrun): suppress persistent cache test"

This reverts commit 5d6e722debd591be5ad1f227f6befad778858db5.

GitOrigin-RevId: 74e184d5c691cf441d32a0a512cea6250d29f9dd

imperative/python/test/unit/utils/test_utils.py

@@ -3,7 +3,6 @@ import pytest
 from megengine.utils.persistent_cache import _manager
 
 
-@pytest.mark.skip(reason="fixme: github ci failed")
 def test_persistent_cache():
     pc = _manager
     k0 = b"\x00\x00"