Bump version to 2.8.3

Fully support PHP 8.x

cache/installedVersion.json

@@ -1,4 +1,4 @@
 {
   "id": 782014,
-  "tag_name": "v2.8.2"
+  "tag_name": "v2.8.3"
 }

config/config.ini.example

@@ -4,7 +4,7 @@ site.url = ""
 ; Your timezone
 timezone = "Asia/Jakarta"
 
-; Date format. See: https://www.php.net/manual/en/function.strftime
+; Date format.
 date.format = "d F Y"
 
 ; Your language (example "en_US" for English or "de_DE" for German. See lang directory for available language)