Composer version is too low to get the 'symfony/flex' lib working

Bug Report

• At what date and time did you most recently experience the problem?
  20/01/2023

• Where did you experience the problem? E.g. Azure Web Apps, Azure Functions, Azure Container Registry, or offline use.
  Azure Web Apps

• If your repo is publicly available please share its URL:
  No

• What happened?
  When running composer install --ignore-platform-reqs --no-interaction, if you set "symfony/flex" lib to version 2+, it will failed with error message The "symfony/flex" plugin was skipped because it requires a Plugin API version ("^2.1") that does not match your Composer installation ("2.0.0"). You may need to run composer update with the "--no-plugins" option.

However, if you set "symfony/flex" lib to version 1+, it is success.

• What did you expect or want to happen?
  Make the deployment success when using the latest version of "symfony/flex"

• How can we reproduce it?
  In composer.json file, change "symfony/flex": "^1" to "symfony/flex": "^2"

• Do you have log output? Please include between the backticks:

The "symfony/flex" plugin was skipped because it requires a Plugin API version ("^2.1") that does not match your Composer installation ("2.0.0"). You may need to run composer update with the "--no-plugins" option.