fix(media): remove duplicate region_tag dependencies

[Kef131]

Description

Fixes #
b/527028805

Clean up duplicate and generic "dependencies" region tags in media samples (media/transcoder/pom.xml).

Checklist

• I have followed Sample Format Guide
• pom.xml parent set to latest shared-configuration
• Appropriate changes to README are included in PR
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• Tests pass: mvn clean verify required (failed locally due to storage permissions issues in the current GCP credentials environment)
• Lint passes: mvn -P lint checkstyle:check required
• Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only (failed compiler plug-in execution due to JDK 25 and ErrorProne incompatibility)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[gemini-code-assist]

Code Review

This pull request removes the region tag comments [START dependencies] and [END dependencies] from the pom.xml file in the media/transcoder directory. There are no review comments, and I have no feedback to provide.

[snippet-bot]

Here is the summary of changes.

You are about to delete 1 region tag.

• media/transcoder/pom.xml:38, tag dependencies

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