Fix exception string tests to use modernized tuple type annotations

Co-authored-by: mdboom <38294+mdboom@users.noreply.github.com>

Author: Copilot

cuda_core/tests/test_memory.py

@@ -229,9 +229,9 @@ def test_buffer_dunder_dlpack():
         buffer.__dlpack__(dl_device=[])
     with pytest.raises(BufferError, match=r"^Sorry, not supported: copy=True$"):
         buffer.__dlpack__(copy=True)
-    with pytest.raises(BufferError, match=r"^Expected max_version Tuple\[int, int\], got \[\]$"):
+    with pytest.raises(BufferError, match=r"^Expected max_version tuple\[int, int\], got \[\]$"):
         buffer.__dlpack__(max_version=[])
-    with pytest.raises(BufferError, match=r"^Expected max_version Tuple\[int, int\], got \(9, 8, 7\)$"):
+    with pytest.raises(BufferError, match=r"^Expected max_version tuple\[int, int\], got \(9, 8, 7\)$"):
         buffer.__dlpack__(max_version=(9, 8, 7))