Update main_safehaven307.yml

.github/workflows/main_safehaven307.yml

@@ -24,6 +24,7 @@ jobs:
  - name: npm install, build, and test
  run: |
  npm install --workspaces=false
+ npm install multer --workspaces=false
  npm run build --if-present
  npm run test --if-present
  working-directory: packages/express-backend