DOC-3224: Bump productminorversion to 8.3.

Author: kemister85

antora.yml

@@ -26,7 +26,7 @@ asciidoc:
     # product variables
     productname: TinyMCE
     productmajorversion: 8
-    productminorversion: '8.1'
+    productminorversion: '8.3'
     ##### product name in codeblock
     prodnamecode: tinymce
     #### more names