chore: make SyncCodecPipeline the default for benchmarking

This branch exists to run CI benchmarks against SyncCodecPipeline.
The dev branch keeps BatchedCodecPipeline as the default; this single
commit on top flips it so the benchmark suite exercises the new
pipeline end-to-end.

Author: d-v-b

src/zarr/core/config.py

@@ -104,7 +104,7 @@ def enable_gpu(self) -> ConfigSet:
             "threading": {"max_workers": None},
             "json_indent": 2,
             "codec_pipeline": {
-                "path": "zarr.core.codec_pipeline.BatchedCodecPipeline",
+                "path": "zarr.core.codec_pipeline.SyncCodecPipeline",
                 "batch_size": 1,
             },
             "codecs": {

tests/test_config.py

@@ -61,7 +61,7 @@ def test_config_defaults_set() -> None:
                 "threading": {"max_workers": None},
                 "json_indent": 2,
                 "codec_pipeline": {
-                    "path": "zarr.core.codec_pipeline.BatchedCodecPipeline",
+                    "path": "zarr.core.codec_pipeline.SyncCodecPipeline",
                     "batch_size": 1,
                 },
                 "codecs": {