chore: update and fix logback versions used in test

[zhumin8]

These are test only dependencies, dependabot alerts should not matter as code is not shipped and test is in controlled env.
However, it is good practice to update versions when possible.

[gemini-code-assist]

Summary of Changes

Hello @zhumin8, 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 focuses on updating and standardizing Logback test dependencies within the java-showcase/gapic-showcase module. The changes address potential Dependabot alerts by introducing a dedicated property for SLF4J 2.x compatible Logback versions and ensuring consistent versioning for SLF4J 1.x compatible Logback components, improving overall dependency management and reducing future maintenance overhead for test environments.

Highlights

• New Logback Version Property: Introduced a new property, slf4j2-logback.version, set to 1.5.21, to manage Logback versions compatible with SLF4J 2.x.
• Logback Dependency Updates: Updated logback-classic and logback-core test dependencies to utilize the newly defined slf4j2-logback.version property.
• Logback Version Harmonization: Corrected and harmonized logback-classic and logback-core test dependencies to consistently use the slf4j1-logback.version property, specifically fixing logback-core from 1.3.15 to 1.2.13.
• Version Comment Clarification: Added a comment to the slf4j1-logback.version property, clarifying that it represents the last version supporting SLF4J 1.x.

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[gemini-code-assist]

Code Review

This pull request updates and fixes the logback dependency versions used for testing. The changes are well-structured, introducing a new Maven property for logback versions compatible with SLF4J 2.x and using it to update the dependencies. This also fixes an incorrect logback-core version in one of the profiles, ensuring compatibility with SLF4J 1.x. These changes improve the project's maintainability and correctness. I have one minor suggestion to improve code cleanliness.

[sonarqubecloud]

Quality Gate passed for 'gapic-generator-java-root'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed for 'java_showcase_integration_tests'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud