fix: resolve CI/CD test failures and linting issues

tests/test_converters/test_env.py

@@ -3,7 +3,6 @@
 import pytest
 import tempfile
 import os
-from pathlib import Path
 
 from config_convert.converters import ENVConverter
 
@@ -97,7 +96,6 @@ class TestENVConverter:
             os.unlink(path)
 
     def test_dump_file(self, converter, temp_dir, sample_env):
-        import shutil
         path = tempfile.mktemp(suffix=".env")
         try:
             data = converter.loads(sample_env)
@@ -105,7 +103,7 @@ class TestENVConverter:
             result = converter.load(path)
             assert result == data
         finally:
-            if Path(path).exists():
+            if os.path.exists(path):
                 os.unlink(path)
 
     def test_invalid_env_raises(self, converter):