Upgrade to SQLite 3.28.0

Over the years, multiple security vulnerabilities[1] have been found
and fixed in SQLite3, so it makes sense to update our bundled libsqlite
to the latest available version.

[1] <https://www.cvedetails.com/vulnerability-list/vendor_id-9237/Sqlite.html>

Author: cmb69

NEWS

@@ -2,7 +2,8 @@ PHP                                                                        NEWS
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 ?? ??? 2019, PHP 7.1.31
 
-
+- SQLite:
+  . Upgraded to SQLite 3.28.0. (cmb)
 
 30 May 2019, PHP 7.1.30