chore(deps): update phpmyadmin/phpmyadmin docker tag to v4.9

This MR contains the following updates:

Package	Update	Change
phpmyadmin/phpmyadmin	minor	4.8 -> 4.9

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Release Notes

phpmyadmin/docker (phpmyadmin/phpmyadmin)

v4.9

• Add tzdata package
• Extract downloaded files directly to web root /var/www/html/ (#​277)
• Add SHA checksum when downloading a version
• Improved UPLOAD_LIMIT documentation
• Update documentation from phpmyadmin/phpmyadmin to phpmyadmin
• phpmyadmin is now the official image in the Docker official library

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