Starting from pygolang@95fd2889 pygolang needs zodbpickle for tests. So without pinning zodbpickle testnodes starrted to error with

Installing gpython-interpreter.
While:
  Installing gpython-interpreter.
  Base installation request: 'pygolang[all_test]'
    Requirement of pygolang[all_test]: py; python_version >= "3" and extra == "all_test"
    Requirement of pygolang[all_test]: zodbpickle; extra == "all-test"
    Requirement of pygolang[all_test]: wheel; extra == "all-test"
    Requirement of pygolang[all_test]: setuptools-dso>=2.8; extra == "all-test"
    Requirement of pygolang[all_test]: setuptools; extra == "all-test"
    Requirement of pygolang[all_test]: pytest; extra == "all-test"
    Requirement of pygolang[all_test]: numpy; extra == "all-test"
    Requirement of pygolang[all_test]: ipython; extra == "all-test"
    Requirement of pygolang[all_test]: cython<3; extra == "all-test"
    Requirement of pygolang[all_test]: geventmp; python_version >= "3" and platform_system != "Windows"
    Requirement of pygolang[all_test]: setuptools>=60.2; python_version >= "3"
    Requirement of pygolang[all_test]: setuptools-dso>=2.8
    Requirement of pygolang[all_test]: decorator
    Requirement of pygolang[all_test]: six
    Requirement of pygolang[all_test]: gevent
  Getting distribution for 'zodbpickle; extra == "all-test"'.
Error: Picked: zodbpickle = 4.2

The `zodbpickle` egg does not have a version pin and `allow-picked-versions = false`.

To resolve this, add

    zodbpickle = 4.2

to the [versions] section,

OR set `allow-picked-versions = true`.

/cc @jerome