Issue #3383462 by phenaproxima, tedbow: Update Composer Stager to beta and unpin the constraint

composer.json

package_manager/src/ComposerInspector.php

package_manager/src/Event/CollectPathsToExcludeEvent.php

package_manager/src/NoSymlinksPointToADirectory.php

package_manager/src/PackageManagerServiceProvider.php

package_manager/src/ProcessFactory.php

package_manager/src/ProcessOutputCallback.php

package_manager/src/StageBase.php

package_manager/src/TranslatableStringAdapter.php

package_manager/src/Validator/SymlinkValidator.php

...ts/modules/fixture_manipulator/src/FixtureManipulator.php

...dules/fixture_manipulator/src/StageFixtureManipulator.php

...ts/modules/package_manager_bypass/src/LoggingBeginner.php

...s/modules/package_manager_bypass/src/LoggingCommitter.php

...r/tests/modules/package_manager_bypass/src/NoOpStager.php

package_manager/tests/src/Kernel/ComposerInspectorTest.php

package_manager/tests/src/Kernel/ProcessFactoryTest.php

package_manager/tests/src/Kernel/SymlinkValidatorTest.php

package_manager/tests/src/Unit/ProcessOutputCallbackTest.php

scripts/install_module.sh