deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.82.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:google-cloud-spanner-bom	6.81.2 -> 6.82.0

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Release Notes

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

v6.82.0

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Features

• Add option for retrying DML as PDML (#​3480) (b545557)
• Add the last statement option to ExecuteSqlRequest and ExecuteBatchDmlRequest (76ab801)

Bug Fixes

• deps: Update the Java code generator (gapic-generator-java) to 2.50.0 (76ab801)
• Shutdown built in metrics meter provider (#​3518) (c935e2e)
• spanner: GetEdition() is returning null for Instance (#​3496) (77cb585)

Dependencies

• Update dependency commons-io:commons-io to v2.18.0 (#​3492) (5c8b3ad)

Documentation

• Add Multi Region Encryption samples (#​3524) (316f971)

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