fix: override vulnerable mysql2 dependency

[lmdanavanem]

Summary

• override Prisma's vulnerable mysql2 3.15.3 transitive dependency
• resolve it to mysql2 3.24.3, above the 3.22.0 patched baseline
• keep the override scoped to the npm dependency graph

Verification

• Prisma Client generation passed
• ESLint passed with existing non-blocking warnings
• production build passed
• GitHub Quality runs PostgreSQL migrations and all 151 tests