Update dependency com.google.cloud:google-cloud-spanner to v6.66.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:google-cloud-spanner	6.65.1 -> 6.66.0

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Release Notes

googleapis/java-spanner (com.google.cloud:google-cloud-spanner)

v6.66.0

Compare Source

Features

• Allow DDL with autocommit=false (#​3057) (22833ac)
• Include stack trace of checked out sessions in exception (#​3092) (ba6a0f6)

Bug Fixes

• Multiplexed session metrics were not included in refactor move (#​3088) (f3589c4)

Dependencies

• Update dependency com.google.cloud:sdk-platform-java-config to v3.30.0 (#​3082) (ddfc98e)

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