chore(deps): update dependency com.google.cloud:google-cloud-spanner to v6.81.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:google-cloud-spanner	6.79.0 -> 6.81.0

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Release Notes

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

v6.81.0

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Features

• Client built in metrics (#​3408) (6a36103)

Dependencies

• Update dependency com.google.cloud:google-cloud-monitoring to v3.54.0 (#​3439) (cdec63f)

v6.80.1

Compare Source

Dependencies

• Update googleapis/sdk-platform-java action to v2.49.0 (#​3430) (beb788c)
• Update sdk platform java dependencies (#​3431) (eef03e9)

v6.80.0

Compare Source

Features

• Enabling endToEndTracing support in Connection API (#​3412) (16cc6ee)

Dependencies

• Update dependency com.google.cloud:sdk-platform-java-config to v3.38.0 (#​3424) (b727453)
• Update dependency io.opentelemetry:opentelemetry-bom to v1.43.0 (#​3399) (a755c6c)
• Update dependency io.opentelemetry:opentelemetry-sdk-testing to v1.43.0 (#​3398) (693243a)
• Update googleapis/sdk-platform-java action to v2.48.0 (#​3422) (d5d1f55)

Documentation

• Fix tracing sample to exit when completed, and use custom monitored resource for export (#​3287) (ddb65b1)

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