Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^9, found phpunit/phpunit[9.0.0, ..., 9.6.21] but these were not loaded, likely because it conflicts with another require. Problem 2 - drupal/core-dev is locked to version 11.0.5 and an update of this package was not requested. - drupal/core-dev 11.0.5 requires phpunit/phpunit ^10.5.19 -> found phpunit/phpunit[10.5.19, ..., 10.5.38] but it conflicts with your root composer.json require (^9).

Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires drupal/islandora dev-github-testing as dev-2.x -> satisfiable by drupal/islandora[dev-github-testing]. - drupal/context[4.0.0-beta1, ..., 4.0.0-beta2] require drupal/core ~8.0 -> found drupal/core[8.0.0-beta6, ..., 8.9.x-dev] but the package is fixed to 11.0.5 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command. - drupal/context[4.0.0-beta3, ..., 4.x-dev] require drupal/core ^8.8 || ^9 -> found drupal/core[8.8.0-alpha1, ..., 8.9.x-dev, 9.0.0-alpha1, ..., 9.5.x-dev] but the package is fixed to 11.0.5 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command. - drupal/context[5.0.0-rc1, ..., 5.x-dev] require drupal/core ^9.3 || ^10 -> found drupal/core[9.3.0-alpha1, ..., 9.5.x-dev, 10.0.0-alpha1, ..., 10.4.x-dev] but the package is fixed to 11.0.5 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command. - drupal/islandora dev-github-testing requires drupal/context ^4 || ^5@RC -> satisfiable by drupal/context[4.0.0-beta1, ..., 4.x-dev, 5.0.0-rc1, 5.x-dev]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.