build(deps): bump graphql-ws from 5.16.2 to 6.0.7 in /backend

Bumps [graphql-ws](https://github.com/enisdenjo/graphql-ws) from 5.16.2 to 6.0.7.
- [Release notes](https://github.com/enisdenjo/graphql-ws/releases)
- [Changelog](https://github.com/enisdenjo/graphql-ws/blob/master/CHANGELOG.md)
- [Commits](https://github.com/enisdenjo/graphql-ws/compare/v5.16.2...v6.0.7)

---
updated-dependencies:
- dependency-name: graphql-ws
  dependency-version: 6.0.7
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

backend/package.json

@@ -51,7 +51,7 @@
     "graphql-shield": "^7.6.5",
     "graphql-subscriptions": "^2.0.0",
     "graphql-upload": "^13.0.0",
-    "graphql-ws": "^5.16.2",
+    "graphql-ws": "^6.0.7",
     "helmet": "~8.1.0",
     "ioredis": "^5.9.3",
     "jsonwebtoken": "~8.5.1",

backend/yarn.lock

@@ -6589,12 +6589,7 @@ graphql-upload@^13.0.0:
     http-errors "^1.8.1"
     object-path "^0.11.8"
 
-graphql-ws@^5.16.2:
-  version "5.16.2"
-  resolved "https://registry.yarnpkg.com/graphql-ws/-/graphql-ws-5.16.2.tgz#7b0306c1bdb0e97a05e800ccd523f46fb212e37c"
-  integrity sha512-E1uccsZxt/96jH/OwmLPuXMACILs76pKF2i3W861LpKBCYtGIyPQGtWLuBLkND4ox1KHns70e83PS4te50nvPQ==
-
-graphql-ws@^6.0.6:
+graphql-ws@^6.0.6, graphql-ws@^6.0.7:
   version "6.0.7"
   resolved "https://registry.yarnpkg.com/graphql-ws/-/graphql-ws-6.0.7.tgz#140307a513f0ba659ecec618d6cf15354a842f96"
   integrity sha512-yoLRW+KRlDmnnROdAu7sX77VNLC0bsFoZyGQJLy1cF+X/SkLg/fWkRGrEEYQK8o2cafJ2wmEaMqMEZB3U3DYDg==