fix(ci): Remove unused files to avoid disk full

[shino]

cf.

• https://zenn.dev/pinto0309/scraps/c6413eb15a1b2a (in Japanese)
• Ubuntu images are running out of disk space actions/runner-images#709

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Type of change

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• Bug fix (non-breaking change which fixes an issue)

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• https://github.com/future-architect/vuls/actions/runs/9432941692/job/25983315399
• actions executed in the debug branch master...shino/debug-release

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Reference

• https://blog.github.com/2015-01-21-how-to-write-the-perfect-pull-request/