deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.55.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:google-cloud-spanner-bom	6.53.0 -> 6.55.0

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Release Notes

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

v6.55.0

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Features

• Add java sample for managed autoscaler (#​2709) (9ea4f4f)

Bug Fixes

• deps: Update the Java code generator (gapic-generator-java) to 2.30.0 (#​2703) (961aa78)

Dependencies

• Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.20.0 (#​2746) (12bcabb)
• Update dependency commons-io:commons-io to v2.15.1 (#​2745) (b9d9571)

v6.54.0

Compare Source

Features

• Enable session leaks prevention by cleaning up long-running tra… (#​2655) (faa7e5d)

Bug Fixes

• Copy backup issue when backup is done across different instance IDs (#​2732) (7f6b158)
• Respect SPANNER_EMULATOR_HOST env var when autoConfigEmulator=true (#​2730) (9c19934)

Dependencies

• Update dependency com.google.cloud:google-cloud-trace to v2.30.0 (#​2725) (8618042)

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