deps: update module cloud.google.com/go/spanner to v1.64.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cloud.google.com/go/spanner	v1.63.0 -> v1.64.0

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[forking-renovate[bot]]

ℹ Artifact update notice

File name: benchmarks/latency-comparison/golang/go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 1 additional dependency was updated

Details:

Package	Change
google.golang.org/genproto/googleapis/api	v0.0.0-20240610135401-a8a62080eff3 -> v0.0.0-20240617180043-68d350f18fd4