refactor: remove unused PlScanCsv

Haven't needed this alias since aede7f6

scripts/flights2.py

@@ -33,7 +33,7 @@
 from collections.abc import Iterable, Sequence
 from functools import cached_property
 from pathlib import Path
-from typing import IO, TYPE_CHECKING, Annotated, Literal
+from typing import TYPE_CHECKING, Annotated, Literal
 
 import niquests
 import polars as pl
@@ -128,20 +128,6 @@
 """Anything that can be converted into a ``DateRange``."""
 
 
-type PlScanCsv = (
-    str
-    | Path
-    | IO[str]
-    | IO[bytes]
-    | bytes
-    | list[str]
-    | list[Path]
-    | list[IO[str]]
-    | list[IO[bytes]]
-    | list[bytes]
-)
-
-
 def is_chrono_str(s: Any) -> TypeIs[_ChronoFormat]:
     return s == "%Y/%m/%d %H:%M" or (isinstance(s, str) and s.startswith("%"))