Ignore some lines for coverage

Author: dstansby

numcodecs/checksum32.py

@@ -10,7 +10,7 @@
 from .jenkins import jenkins_lookup3
 
 if TYPE_CHECKING:
-    from typing_extensions import Buffer
+    from typing_extensions import Buffer  # pragma: no cover
 
 CHECKSUM_LOCATION = Literal['start', 'end']
 

numcodecs/tests/test_zarr3.py

@@ -8,7 +8,7 @@
 if not TYPE_CHECKING:
     zarr = pytest.importorskip("zarr")
 else:
-    import zarr
+    import zarr  # pragma: no cover
 
 import zarr.storage
 from zarr.core.common import JSON