chore(deps-dev): bump eslint-plugin-sonarjs from 1.0.4 to 3.0.3

Bumps [eslint-plugin-sonarjs](https://github.com/SonarSource/SonarJS) from 1.0.4 to 3.0.3.
- [Release notes](https://github.com/SonarSource/SonarJS/releases)
- [Commits](https://github.com/SonarSource/SonarJS/commits)

---
updated-dependencies:
- dependency-name: eslint-plugin-sonarjs
  dependency-version: 3.0.3
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -44,7 +44,7 @@
     "eslint-plugin-import": "^2.32.0",
     "eslint-plugin-no-null": "^1.0.2",
     "eslint-plugin-redundant-undefined": "^1.0.0",
-    "eslint-plugin-sonarjs": "^1.0.4",
+    "eslint-plugin-sonarjs": "^3.0.3",
     "prettier": "^3.3.3",
     "prettier-plugin-svelte": "^3.4.0",
     "svelte": "5.34.7",

packages/backend/package.json

@@ -67,7 +67,7 @@
     "eslint-plugin-import": "^2.32.0",
     "eslint-plugin-no-null": "^1.0.2",
     "eslint-plugin-redundant-undefined": "^1.0.0",
-    "eslint-plugin-sonarjs": "^1.0.4",
+    "eslint-plugin-sonarjs": "^3.0.3",
     "prettier": "^3.3.3",
     "typescript": "5.8.3",
     "vite": "^6.3.5",