chore(core): upgrade phpdotenv to remove deprecation warnings (#1364)

Author: mmachatschek

composer.json

@@ -37,7 +37,7 @@
         "symfony/var-exporter": "^7.1",
         "symfony/yaml": "^7.3",
         "tempest/highlight": "^2.11.4",
-        "vlucas/phpdotenv": "^5.6",
+        "vlucas/phpdotenv": "^5.6.1",
         "voku/portable-ascii": "^2.0.3"
     },
     "require-dev": {