bpo-25130: Make SQLite tests more compatible with PyPy (GH-28021)

(cherry picked from commit 07d3d54f4e84b1259b800884b202701f69e408d8)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
diff --git a/Lib/sqlite3/test/dbapi.py b/Lib/sqlite3/test/dbapi.py
index 5d521d0..a8dcd7e 100644
--- a/Lib/sqlite3/test/dbapi.py
+++ b/Lib/sqlite3/test/dbapi.py
@@ -398,6 +398,9 @@ class MyIter:
             def __init__(self):
                 self.value = 5
 
+            def __iter__(self):
+                return self
+
             def __next__(self):
                 if self.value == 10:
                     raise StopIteration