1762438 - add CI for Python 3.10

Status: RESOLVED FIXED

(Conduit :: moz-phab, task)

Description

[Connor Sheehan [:sheehan]]

We dropped 3.6, now we should add 3.10. We already have quite a few users on this platform so we should be testing against it.

Comment 1

[Connor Sheehan [:sheehan]]

Attachment: ci: add workflows and support for Python 3.10 (Bug 1762438) r=zeid

Adds a CircleCI job for Python 3.10 testing, a docker-compose
command to generate requirements for Python 3.10 and the result
of running the command. Amend README.md to include the new
command.

The current versions of black and pytest fail to install on
Python 3.10, so upgrade them in all requirements files. For black
this also requires a slight syntax change to
tests/test_integration_git.py, so add those syntax changes.