Dependabot can't resolve your PHP dependency files

[dependabot-preview]

Dependabot can't resolve your PHP dependency files.

As a result, Dependabot couldn't update your dependencies.

The error Dependabot encountered was:

Your requirements could not be resolved to an installable set of packages.
  Problem 1
    - wikimedia/composer-merge-plugin 1.5.x-dev is an alias of wikimedia/composer-merge-plugin dev-master and thus requires it to be installed too.
    - wikimedia/composer-merge-plugin v1.4.1 requires composer-plugin-api ^1.0 -> found composer-plugin-api[2.0.0] but it does not match the constraint.
    - wikimedia/composer-merge-plugin dev-master requires composer-plugin-api ^1.1 -> found composer-plugin-api[2.0.0] but it does not match the constraint.
    - Root composer.json requires wikimedia/composer-merge-plugin ^1.4.1 -> satisfiable by wikimedia/composer-merge-plugin[v1.4.1, 1.5.x-dev (alias of dev-master)].

You are using Composer 2, which some of your plugins seem to be incompatible with. Make sure you update your plugins or report a plugin-issue to ask them to support Composer 2.

If you think the above is an error on Dependabot's side please don't hesitate to get in touch - we'll do whatever we can to fix it.

View the update logs.