Bump prettier from 3.3.3 to 3.4.2 in /backend

Bumps [prettier](https://github.com/prettier/prettier) from 3.3.3 to 3.4.2.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](prettier/prettier@3.3.3...3.4.2)

---
updated-dependencies:
- dependency-name: prettier
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

backend/package.json

@@ -113,7 +113,7 @@
     "eslint-plugin-security": "^3.0.1",
     "jest": "^29.7.0",
     "nodemon": "~3.1.7",
-    "prettier": "^3.3.3",
+    "prettier": "^3.4.2",
     "rosie": "^2.1.1",
     "ts-jest": "^29.2.5",
     "ts-node": "^10.9.2",

backend/yarn.lock

@@ -7865,10 +7865,10 @@ prettier-linter-helpers@^1.0.0:
   dependencies:
     fast-diff "^1.1.2"
 
-prettier@^3.3.3:
-  version "3.3.3"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.3.3.tgz#30c54fe0be0d8d12e6ae61dbb10109ea00d53105"
-  integrity sha512-i2tDNA0O5IrMO757lfrdQZCc2jPNDVntV0m/+4whiDfWaTKfMNgR7Qz0NAeGz/nRqF4m5/6CLzbP4/liHt12Ew==
+prettier@^3.4.2:
+  version "3.4.2"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.4.2.tgz#a5ce1fb522a588bf2b78ca44c6e6fe5aa5a2b13f"
+  integrity sha512-e9MewbtFo+Fevyuxn/4rrcDAaq0IYxPGLvObpQjiZBMAzB9IGmzlnG9RZy3FFas+eBMu2vA0CszMeduow5dIuQ==
 
 pretty-format@^29.0.0, pretty-format@^29.7.0:
   version "29.7.0"