drupal/linkit is fixed to 6.0.x-dev (lock file version) by a partial update but that version is rejected by your minimum-stability.

drupal/linkit is fixed to 6.0.x-dev (lock file version) by a partial update but that version is rejected by your minimum-stability. 

Solution

Update your composer.json file to allow the required version of the Linkit module:

"require": {
    "drupal/linkit": "6.0.x-dev"
}

Other solutions:

If the minimum-stability setting in your composer.json file is too strict, you can change it to "dev":

"minimum-stability": "dev"

Alternatively, if you don't want to change the minimum stability for the whole project, you can add the "prefer-stable" option:

"prefer-stable": true

Run the composer update command, specifying the Linkit module:

composer update drupal/linkit --with-dependencies

This command will update the Linkit module and its dependencies to the specified version, while also adhering to the stability requirements set in your composer.json file.

If you still encounter issues, consider using a more stable version of the module that meets your project's minimum stability requirements, or adjust the requirements to allow for the desired version of the module.