ci(chore): improve the prefix field in the dependabot.yml file

[kurosakishigure]

Summary of Changes

1. Commit message (if applicable)

Description

• What is the purpose of this PR?
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• What problem does it solve?
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• Are there any breaking changes or backwards compatibility issues?
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Related Issue

• Closes #number (if applicable)

Checklist

• I have read and followed the guidelines in CONTRIBUTING.md
• I have already updated the related examples accordingly (if applicable)
• I have written or updated relevant docs (if applicable)
• I have already updated the related CI accordingly (if applicable)
• I have added or updated tests to cover my changes (if applicable)
• I have already updated the related build system accordingly (if applicable)
• I have reviewed my code for any potential issues

Additional Notes

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