Fix `.github/workflows/codecov.yml`

[alexmerlin]

Bug Report

As reported by this GHA:

Invalid workflow file: .github/workflows/codecov.yml#L46
The workflow is not valid. .github/workflows/codecov.yml (Line: 46, Col: 11): Unexpected value 'COMPOSER_DEV_MODE=1'

.github/workflows/codecov.yml contains invalid code:

- name: Install dependencies with composer
  env:
    COMPOSER_DEV_MODE=1
  run: composer install --prefer-dist --no-interaction --no-progress --optimize-autoloader --ansi

Q	A
Version(s)	x.y.z

Summary

Current behavior

How to reproduce

Expected behavior