Pin logback 1.5.20 in io-expansion-service

[Abacn]

Tested with a query ./gradlew :sdks:java:io:expansion-service:dependencies

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[gemini-code-assist]

Summary of Changes

Hello @Abacn, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a potential compatibility issue by explicitly managing the version of the Logback logging library for the io-expansion-service. By forcing a specific version, it ensures that the service continues to function correctly within environments that rely on older Java versions, preventing conflicts that could arise from automatic dependency resolution.

Highlights

• Dependency Pinning: The logback-classic and logback-core dependencies have been explicitly pinned to version 1.5.20 within the io-expansion-service.
• Java 8 Compatibility: This pinning is necessary because logback versions 1.4.x and above dropped support for Java 8, ensuring the io-expansion-service remains compatible with Java 8.

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[github-actions]

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers

[Abacn]

testMissingValueSchemaKnownTakeNull (org.apache.beam.sdk.io.gcp.bigquery.StorageApiSinkDefaultValuesIT) failed not related to the change, merging for now