build(deps-dev): bump tsx from 4.20.3 to 4.20.4 in /backend

Bumps [tsx](https://github.com/privatenumber/tsx) from 4.20.3 to 4.20.4.
- [Release notes](https://github.com/privatenumber/tsx/releases)
- [Changelog](https://github.com/privatenumber/tsx/blob/master/release.config.cjs)
- [Commits](https://github.com/privatenumber/tsx/compare/v4.20.3...v4.20.4)

---
updated-dependencies:
- dependency-name: tsx
  dependency-version: 4.20.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

backend/package-lock.json

@@ -37,7 +37,7 @@
         "eslint-plugin-yml": "^1.18.0",
         "jest": "^30.0.5",
         "ts-jest": "^29.4.1",
-        "tsx": "^4.20.3",
+        "tsx": "^4.20.4",
         "typescript": "^5.9.2"
       }
     },
@@ -8990,9 +8990,9 @@
       "license": "0BSD"
     },
     "node_modules/tsx": {
-      "version": "4.20.3",
-      "resolved": "https://registry.npmjs.org/tsx/-/tsx-4.20.3.tgz",
-      "integrity": "sha512-qjbnuR9Tr+FJOMBqJCW5ehvIo/buZq7vH7qD7JziU98h6l3qGy0a/yPFjwO+y0/T7GFpNgNAvEcPPVfyT8rrPQ==",
+      "version": "4.20.4",
+      "resolved": "https://registry.npmjs.org/tsx/-/tsx-4.20.4.tgz",
+      "integrity": "sha512-yyxBKfORQ7LuRt/BQKBXrpcq59ZvSW0XxwfjAt3w2/8PmdxaFzijtMhTawprSHhpzeM5BgU2hXHG3lklIERZXg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {

backend/package.json

@@ -39,7 +39,7 @@
     "eslint-plugin-yml": "^1.18.0",
     "jest": "^30.0.5",
     "ts-jest": "^29.4.1",
-    "tsx": "^4.20.3",
+    "tsx": "^4.20.4",
     "typescript": "^5.9.2"
   },
   "dependencies": {