chore: drop unused type: ignore in test_codec_invariants

The mypy hook in CI (prek --all-files) type-checks src/ + tests/
together, so BytesBytesCodec is properly resolved when subclassed in
the test — no [misc] ignore needed.

Note: local pre-commit runs (no args) check only staged files in
isolation, which makes zarr's classes look like Any and flags this
class as needing # type: ignore[misc]. That hook is misleading;
prek --all-files (what CI uses) is authoritative.

Author: d-v-b

tests/test_codec_invariants.py

@@ -90,7 +90,7 @@ def test_C1_resolve_metadata_only_mutates_shape(codec: Codec) -> None:
 # ---------------------------------------------------------------------------
 
 
-class _PrototypeRecordingCodec(BytesBytesCodec):  # type: ignore[misc]
+class _PrototypeRecordingCodec(BytesBytesCodec):
     """A no-op BB codec that records the prototype it was called with."""
 
     is_fixed_size = True