fix: Ignore .pth files that are not utf-8 encoded

Issue-300: #300
PR-301: #301

src/griffe/finder.py

@@ -439,8 +439,15 @@ def _handle_pth_file(path: Path) -> list[_SP]:
     # No item is added to sys.path more than once.
     # Blank lines and lines beginning with # are skipped.
     # Lines starting with import (followed by space or tab) are executed.
-    directories = []
-    for line in path.read_text(encoding="utf8").strip().replace(";", "\n").splitlines(keepends=False):
+    directories: list[_SP] = []
+    try:
+        # It turns out PyTorch recommends its users to use `.pth` as the extension
+        # when saving models on the disk. These model files are not encoded in UTF8.
+        # If UTF8 decoding fails, we skip the .pth file.
+        text = path.read_text(encoding="utf8")
+    except UnicodeDecodeError:
+        return directories
+    for line in text.strip().replace(";", "\n").splitlines(keepends=False):
         line = line.strip()  # noqa: PLW2901
         if _re_import_line.match(line):
             editable_module = path.parent / f"{line[len('import'):].lstrip()}.py"