Update ship date for GitHub Enterprise Server 3.6's release candidate (github#28638)

Author: mattpollard

lib/enterprise-dates.json

@@ -116,7 +116,7 @@
     "deprecationDate": "2023-05-31"
   },
   "3.6": {
-    "releaseDate": "2022-07-19",
+    "releaseDate": "2022-07-26",
     "deprecationDate": "2023-08-16"
   },
   "3.7": {
@@ -127,4 +127,4 @@
     "releaseDate": "2023-02-07",
     "deprecationDate": "2024-03-07"
   }
-}
+}