chore(deps): update dependency google-cloud-spanner to v3.56.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
google-cloud-spanner	==3.55.0 -> ==3.56.0

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Release Notes

googleapis/python-spanner (google-cloud-spanner)

v3.56.0

Compare Source

Features

• Add support for multiplexed sessions - read/write (#​1389) (ce3f230)
• Add support for multiplexed sessions (#​1383) (21f5028)
• Default enable multiplex session for all operations unless explicitly set to false (#​1394) (651ca9c)
• spanner: Add new change_stream.proto (#​1382) (ca6255e)

Performance Improvements

• Skip gRPC trailers for StreamingRead & ExecuteStreamingSql (#​1385) (cb25de4)

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