Add missing dep.

Author: ionelmc

tox.ini

@@ -40,7 +40,7 @@ deps =
     pytest-cov
     pg3: psycopg
     {py38,py39,py310,py311,py312}-pg2: psycopg2-binary
-    {pypy38,pypy39}-pg2: psycopg2cffi
+    {pypy38,pypy39,pypy310}-pg2: psycopg2cffi
 commands =
     {posargs:pytest --cov --cov-report=term-missing --cov-report=xml -vv tests}