Manifest endpoint update for Sri Lanka production server migration to…

… datacenter (#5377)

**Story card:**
[sc-9896](https://app.shortcut.com/simpledotorg/story/9896)

## Because

The production environment for Simple Sri Lanka is in the process of
being migrated to a datacenter. The DNS has consequently been changed
and this update needs to be reflected in the production manifest file.

public/manifest/production.json

@@ -20,7 +20,7 @@
     },
     {
       "country_code": "LK",
-      "endpoint": "https://api.lk.simple.org/api/",
+      "endpoint": "https://api-simple.health.gov.lk/api/",
       "display_name": "Sri Lanka",
       "isd_code": "94"
     },
@@ -73,7 +73,7 @@
         "deployments": [
           {
             "display_name": "Sri Lanka",
-            "endpoint": "https://api.lk.simple.org/api/"
+            "endpoint": "https://api-simple.health.gov.lk/api/"
           }
         ]
       },