deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.87.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:google-cloud-spanner-bom	6.86.0 -> 6.87.0

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Release Notes

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

v6.87.0

Compare Source

Features

• Add AddSplitPoints API (a5ebcd3)
• Add option for multiplexed sessions with partitioned operations (#​3635) (dc89b4d)
• Add option to indicate that a statement is the last in a transaction (#​3647) (b04ea80)
• Adding gfe_latencies metric to built-in metrics (#​3490) (314dadc)
• spanner: Support multiplexed session for read-write transactions (#​3608) (bda78ed)

Bug Fixes

• deps: Update the Java code generator (gapic-generator-java) to 2.53.0 (20a3d0d)
• spanner: End spans for read-write methods (#​3629) (4a1f99c)
• spanner: Release resources in TransactionManager (#​3638) (e0a3e5b)

Dependencies

• Update dependency com.google.cloud:sdk-platform-java-config to v3.43.0 (#​3642) (c12968a)

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