Update dependency @types/multer to v1.4.7

Editor assessment

Updating @types/multer to v1.4.7 names the dependency and target version exactly, with chore(deps) correctly typing and scoping the maintenance bump. The header fully identifies the change, so no diff is needed. No body follows, which is appropriate for a type-definition refresh, and no footers appear, none being owed. Hygiene is clean: imperative mood, no trailing period, precise subject, no ticket junk, no pasted content. A routine dependency update communicated in one complete line — sufficient, unambiguous, and free of anything that would mislead.