Bump path-to-regexp from 6.2.1 to 6.3.0 in /backend

Bumps [path-to-regexp](https://github.com/pillarjs/path-to-regexp) from 6.2.1 to 6.3.0.
- [Release notes](https://github.com/pillarjs/path-to-regexp/releases)
- [Changelog](https://github.com/pillarjs/path-to-regexp/blob/master/History.md)
- [Commits](https://github.com/pillarjs/path-to-regexp/compare/v6.2.1...v6.3.0)

---
updated-dependencies:
- dependency-name: path-to-regexp
  dependency-type: indirect
...

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

backend/package-lock.json

@@ -5393,9 +5393,9 @@
             "dev": true
         },
         "node_modules/path-to-regexp": {
-            "version": "6.2.1",
-            "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-6.2.1.tgz",
-            "integrity": "sha512-JLyh7xT1kizaEvcaXOQwOc2/Yhw6KZOvPf1S8401UyLk86CU79LN3vl7ztXGm/pZ+YjoyAJ4rxmHwbkBXJX+yw=="
+            "version": "6.3.0",
+            "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-6.3.0.tgz",
+            "integrity": "sha512-Yhpw4T9C6hPpgPeA28us07OJeqZ5EzQTkbfwuhsUg0c237RomFoETJgmp2sa3F/41gfLE6G5cqcYwznmeEeOlQ=="
         },
         "node_modules/path-type": {
             "version": "4.0.0",