gh-101947: Remove size check from sqlite3 serialize test (GH-102914)

The size of the returned data is too implementation specific.
(cherry picked from commit 61405da)

Co-authored-by: Erlend E. Aasland <[email protected]>

Author: miss-islington

Lib/test/test_sqlite3/test_dbapi.py

@@ -604,7 +604,6 @@ def test_serialize_deserialize(self):
             with cx:
                 cx.execute("create table t(t)")
             data = cx.serialize()
-            self.assertEqual(len(data), 8192)
 
             # Remove test table, verify that it was removed.
             with cx: