fix: address Ruff errors in existing code

Latest Ruff complains about unused variables in two files.

Signed-off-by: Christian Heimes <[email protected]>

Author: tiran

src/fromager/bootstrapper.py

@@ -574,7 +574,7 @@ def _download_wheel_from_cache(
             changelogs = pbi.get_changelog(resolved_version)
             logger.debug(f"{req.name} has change logs {changelogs}")
 
-            dist_name, dist_version, build_tag, _ = wheels.extract_info_from_wheel_file(
+            _, _, build_tag, _ = wheels.extract_info_from_wheel_file(
                 req, wheelfile_name
             )
             if expected_build_tag and expected_build_tag != build_tag:
@@ -604,7 +604,7 @@ def _download_wheel_from_cache(
     def _unpack_metadata_from_wheel(
         self, req: Requirement, resolved_version: Version, wheel_filename: pathlib.Path
     ) -> pathlib.Path | None:
-        dist_name, dist_version, build_tag, _ = wheels.extract_info_from_wheel_file(
+        dist_name, dist_version, _, _ = wheels.extract_info_from_wheel_file(
             req,
             wheel_filename,
         )

tests/test_wheels.py

@@ -1,5 +1,4 @@
 import pathlib
-import tempfile
 import zipfile
 from unittest.mock import Mock, patch
 
@@ -116,7 +115,7 @@ def test_download_wheel_unquotes_url_encoded_filenames(tmp_path: pathlib.Path) -
     # URL with encoded plus sign (%2B)
     wheel_url = "https://example.test/test_pkg-1.0%2Blocal-py3-none-any.whl"
 
-    mock_wheel, mock_wheel_file = tempfile.mkstemp()
+    mock_wheel_file = tmp_path / "mockwheel.whl"
     with zipfile.ZipFile(mock_wheel_file, "w") as zf:
         # Add minimal legitimate files
         zf.writestr("test_pkg/__init__.py", "")