Update dependency captioning/captioning to ^2.6.3

Author: renovate[bot]

composer.json

@@ -14,7 +14,7 @@
     "ext-zip": "*",
     "algolia/algoliasearch-client-php": "^3.4.2",
     "beberlei/doctrineextensions": "^1.5",
-    "captioning/captioning": "^2.6",
+    "captioning/captioning": "^2.6.3",
     "ccmbenchmark/ting_bundle": "^3.8",
     "cocur/slugify": "^2.3",
     "cuyz/valinor-bundle": "^2.0",