DOCS-16251 finalize 5.0.19 changelog (#3916) (#4021)

* DOCS-16251 finalize 5.0.19 changelog

* correct date

Author: ajhuh-mdb

source/release-notes/5.0.txt

@@ -49,8 +49,8 @@ Patch Releases
 
 .. _5.0.19-release-notes:
 
-5.0.19 - Upcoming
-~~~~~~~~~~~~~~~~~
+5.0.19 - Jul 13, 2023
+~~~~~~~~~~~~~~~~~~~~~
 
 - :issue:`SERVER-71985` Automatically retry time series insert on DuplicateKey 
   error