build(deps): bump browserify-sign from 4.2.1 to 4.2.2 in /backend

Bumps [browserify-sign](https://github.com/crypto-browserify/browserify-sign) from 4.2.1 to 4.2.2.
- [Changelog](https://github.com/browserify/browserify-sign/blob/main/CHANGELOG.md)
- [Commits](https://github.com/crypto-browserify/browserify-sign/compare/v4.2.1...v4.2.2)

---
updated-dependencies:
- dependency-name: browserify-sign
  dependency-type: indirect
...

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

backend/package-lock.json

@@ -1698,18 +1698,22 @@
       }
     },
     "node_modules/browserify-sign": {
-      "version": "4.2.1",
-      "license": "ISC",
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.2.2.tgz",
+      "integrity": "sha512-1rudGyeYY42Dk6texmv7c4VcQ0EsvVbLwZkA+AQB7SxvXxmcD93jcHie8bzecJ+ChDlmAm2Qyu0+Ccg5uhZXCg==",
       "dependencies": {
-        "bn.js": "^5.1.1",
-        "browserify-rsa": "^4.0.1",
+        "bn.js": "^5.2.1",
+        "browserify-rsa": "^4.1.0",
         "create-hash": "^1.2.0",
         "create-hmac": "^1.1.7",
-        "elliptic": "^6.5.3",
+        "elliptic": "^6.5.4",
         "inherits": "^2.0.4",
-        "parse-asn1": "^5.1.5",
-        "readable-stream": "^3.6.0",
-        "safe-buffer": "^5.2.0"
+        "parse-asn1": "^5.1.6",
+        "readable-stream": "^3.6.2",
+        "safe-buffer": "^5.2.1"
+      },
+      "engines": {
+        "node": ">= 4"
       }
     },
     "node_modules/browserify-sign/node_modules/readable-stream": {