This release comes with the ability to switch which version of PHP and PHPUnit are running within the action, by passing the php_version and phpunit_version input parameters.
With this change, this action's release version numbering has been reset to v1 to avoid any confusion. Previously, the version of the action was linked directly to the version of PHPUnit that was installed within the action, but that was too limiting.
The previous v6, v7, v8 and v9 releases will still remain available for at least the next 12 months (until November 2021), but after that point it is recommended to use the new versioning system, starting at v1 (this release).
Please see the README for more information. Have fun!