typing fixes

Author: Christian-B

spynnaker/pyNN/models/neuron/synapse_io.py

@@ -386,7 +386,7 @@ def convert_to_connections(
         synapse_info: SynapseInformation, post_vertex_slice: Slice,
         n_pre_atoms: int, max_row_length: int, n_synapse_types: int,
         weight_scales: WeightScales,
-        data: Union[bytes, memoryview, NDArray, None],
+        data: bytearray | bytes | memoryview | NDArray | None,
         delayed: bool, post_vertex_max_delay_ticks: int,
         max_atoms_per_core: int) -> ConnectionsArray:
     """

unittests/model_tests/neuron/test_synaptic_manager.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 import shutil
 import struct
-from typing import Any, BinaryIO, List, Optional, Sequence, Tuple, Union
+from typing import Any, BinaryIO, List, Optional, Sequence, Tuple
 import unittest
 from tempfile import mkdtemp
 import numpy