Update phpmd/phpmd composer dependency to version 2.9.1

[sivaschenko]

Update phpmd/phpmd composer dependency to version 2.9.1

[m2-assistant]

Hi @sivaschenko. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento give me 2.4-develop instance - upcoming 2.4.x release

For more details, please, review the Magento Contributor Assistant documentation.

Please, add a comment to assign the issue: @magento I am working on this

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[sivaschenko]

@magento export issue to Jira project AC as Story

[github-jira-sync-bot]

✅ Jira issue https://jira.corp.magento.com/browse/AC-355 is successfully created for this GitHub issue.

[anzin]

@magento I am working on this