Fix IT failure in sdk/spring/spring-cloud-azure-integration-tests

[rujche]

• Before this fix, link to failure test: https://dev.azure.com/azure-sdk/internal/_build/results?buildId=5785210&view=logs&j=cf5e6108-2b64-5f87-7718-beff375d120b&t=806e1509-ed0a-5d45-2c5f-b78e8c6a5ef5&s=f14e54f5-05fe-5e55-1aa9-be7ac82d47a6
• After this fix, link to passed test: TODO

[rujche]

/azp run java - spring - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Copilot]

Pull request overview

This PR fixes failing Spring integration tests by aligning the Netty version used in the spring-cloud-azure-integration-tests module with the Azure SDK’s supported Netty line, overriding Spring Boot’s newer Netty dependency.

Changes:

• Add a <dependencyManagement> section in spring-cloud-azure-integration-tests/pom.xml to import io.netty:netty-bom:4.1.130.Final, forcing Netty 4.1.x instead of Spring Boot 4.x’s 4.2.x line.
• Register io.netty:netty-bom;4.1.130.Final in eng/versioning/external_dependencies.txt to keep Netty dependency versions centrally tracked and consistent.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
sdk/spring/spring-cloud-azure-integration-tests/pom.xml	Imports netty-bom via dependencyManagement to enforce a Netty 4.1.x version compatible with Azure SDK and unblock the failing integration tests.
eng/versioning/external_dependencies.txt	Adds io.netty:netty-bom at 4.1.130.Final to the central external dependency version list, aligning with the POM change.