Update yiisoft/yii2 requirement from 2.0.49 to 2.0.49.3 in /frontend

Updates the requirements on [yiisoft/yii2](https://github.com/yiisoft/yii2-framework) to permit the latest version.
- [Changelog](https://github.com/yiisoft/yii2-framework/blob/2.0.49.3/CHANGELOG.md)
- [Commits](yiisoft/yii2-framework@2.0.49...2.0.49.3)

---
updated-dependencies:
- dependency-name: yiisoft/yii2
  dependency-type: direct:production
...

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

frontend/composer.json

@@ -12,7 +12,7 @@
     "minimum-stability": "stable",
     "require": {
         "php": ">=5.4.0 || >=8",
-        "yiisoft/yii2": "2.0.49",
+        "yiisoft/yii2": "2.0.49.3",
         "yiisoft/yii2-bootstrap": "~2.0.0",
         "yiisoft/yii2-bootstrap4": "^2.0",
         "overals/yii2-whois": "~1.0.0",