[3.14] gh-131825: Fix sqlite3 timezone-naive adapter recipe (GH-136270) (GH-136467)

gh-131825: Fix `sqlite3` timezone-naive adapter recipe (GH-136270)
(cherry picked from commit 6a6cd3c)

Co-authored-by: NekrodNIK <[email protected]>

Author: miss-islington

Doc/library/sqlite3.rst

@@ -2289,7 +2289,7 @@ This section shows recipes for common adapters and converters.
 
    def adapt_datetime_iso(val):
        """Adapt datetime.datetime to timezone-naive ISO 8601 date."""
-       return val.isoformat()
+       return val.replace(tzinfo=None).isoformat()
 
    def adapt_datetime_epoch(val):
        """Adapt datetime.datetime to Unix timestamp."""