Update symfony/dotenv requirement from ^5.4 || ^6.4 to ^7.1.9

---
updated-dependencies:
- dependency-name: symfony/dotenv
  dependency-type: direct:development
...

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

composer.json

@@ -39,7 +39,7 @@
         "sylius-labs/suite-tags-extension": "^0.2",
         "symfony/browser-kit": "^5.4 || ^6.4",
         "symfony/debug-bundle": "^5.4 || ^6.4",
-        "symfony/dotenv": "^5.4 || ^6.4",
+        "symfony/dotenv": "^7.1.9",
         "symfony/flex": "^2.4",
         "symfony/intl": "^5.4 || ^6.4",
         "symfony/web-profiler-bundle": "^5.4 || ^6.4"