Reintroduce Carbon dependency (#48687)

I believe this was inadvertently removed when resolving a merge conflict
in 8dde5dc

Author: wouterj

src/Illuminate/Support/composer.json

@@ -23,6 +23,7 @@
         "illuminate/conditionable": "^11.0",
         "illuminate/contracts": "^11.0",
         "illuminate/macroable": "^11.0",
+        "nesbot/carbon": "^2.67",
         "voku/portable-ascii": "^2.0"
     },
     "conflict": {