[Snyk] Security upgrade gatsby from 5.13.6 to 5.15.0#23

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Mapuppy09 wants to merge 1 commit intomainfrom

snyk-fix-bf1928b1581655992a510357b700cead

Commits on Aug 31, 2025

fix: package.json & package-lock.json to reduce vulnerabilities
snyk-bot
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