RUM-18954: Remove unused com.github.ben-manes.versions plugin

[0xnm]

What does this PR do?

This plugin is not used, so dropping it. Android Studio can show version updates anyway.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-13T07:05:23.733059Z	5f4f634	PR opened
🔒 Security Review	✅ Completed 2026-10-13T07:06:53.418526Z	5f4f634	PR opened

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• Comment "@codex review" or "@codex security review".

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[datadog-datadog-prod-us1]

More details

No remaining source or CI references rely on the removed dependency-update plugin or its configuration helper.

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[datadog-datadog-prod-us1]

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 62.90% (-0.10%)

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