Bug Report: cimg/python:3.9 fails

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**Describe the bug**
A clear and concise description of what the bug is.
While running the ci image cimg/python:3.9, I get the following error -

**To Reproduce**
Please provide steps to reproduce the behavior, such as a sample job or config file.
Code to reproduce the issue on buildkite -

containers:
default:
docker: cimg/python:3.8

shared:
pip-requirements: &pip-requirements
pip:
requirements: [ "requirements.txt" ]
sync: false

lint: &lint
label: "Lint :lint-roller:"
timeout: 10m
env:
SETUPTOOLS_SCM_PRETEND_VERSION: "0.0.1"
run:
- <<: *pip-requirements
- /app/scripts/lint

test: &test
label: "Test :pytest:"
timeout: 8m
run:
- <<: *pip-requirements
- /app/scripts/test

**Expected behavior**
A clear and concise description of what you expected to happen.
The build should succeed.

**Workarounds**
Are there any current workarounds for this bug that can be used currently?

**Screenshots and Build Links**
If possible, add screenshots and links to jobs to help explain your problem.

**Additional context**
Add any other context about the problem here.