Description

We need to add more upgrade testing from 1.7 to 2.1. While 2.1 drops the task v2 in the shim, older shims without task v3 should still be able to connect. This could be a test issue but we should explicitly test this case.

Steps to reproduce the issue

1. Run upgrade test which starts a shim with 1.7

Describe the results you received and expected

Upgrade tests passing and containers started with a 1.7 shim working with 2.1

What version of containerd are you using?

v2.1.0-beta.0

Any other relevant information

No response

Show configuration if it is related to CRI plugin.

No response