Bump multer from 2.1.0 to 2.1.1 in /backend

Bumps [multer](https://github.com/expressjs/multer) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/expressjs/multer/releases)
- [Changelog](https://github.com/expressjs/multer/blob/main/CHANGELOG.md)
- [Commits](https://github.com/expressjs/multer/compare/v2.1.0...v2.1.1)

---
updated-dependencies:
- dependency-name: multer
  dependency-version: 2.1.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

backend/package-lock.json

@@ -35,7 +35,7 @@
         "mocha": "^11.7.5",
         "moment": "^2.30.1",
         "mongodb": "^7.1.0",
-        "multer": "^2.1.0",
+        "multer": "^2.1.1",
         "node-id3": "^0.2.9",
         "node-schedule": "^2.1.1",
         "openid-client": "^6.8.2",
@@ -3258,9 +3258,9 @@
       "license": "MIT"
     },
     "node_modules/multer": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/multer/-/multer-2.1.0.tgz",
-      "integrity": "sha512-TBm6j41rxNohqawsxlsWsNNh/VdV4QFXcBvRcPhXaA05EZ79z0qJ2bQFpync6JBoHTeNY5Q1JpG7AlTjdlfAEA==",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/multer/-/multer-2.1.1.tgz",
+      "integrity": "sha512-mo+QTzKlx8R7E5ylSXxWzGoXoZbOsRMpyitcht8By2KHvMbf3tjwosZ/Mu/XYU6UuJ3VZnODIrak5ZrPiPyB6A==",
       "license": "MIT",
       "dependencies": {
         "append-field": "^1.0.0",

backend/package.json

@@ -49,7 +49,7 @@
     "mocha": "^11.7.5",
     "moment": "^2.30.1",
     "mongodb": "^7.1.0",
-    "multer": "^2.1.0",
+    "multer": "^2.1.1",
     "node-id3": "^0.2.9",
     "node-schedule": "^2.1.1",
     "openid-client": "^6.8.2",