deps: update module cloud.google.com/go/spanner to v1.66.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cloud.google.com/go/spanner	v1.64.0 -> v1.66.0

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[forking-renovate]

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):

• 3 additional dependencies were updated

Details:

Package	Change
github.com/cespare/xxhash/v2	v2.2.0 -> v2.3.0
github.com/cncf/xds/go	v0.0.0-20240318125728-8a4994d93e50 -> v0.0.0-20240423153145-555b57ec207b
google.golang.org/genproto/googleapis/api	v0.0.0-20240711142825-46eb208f015d -> v0.0.0-20240722135656-d784300faade