6 files declare their use of Collection in Zircon Profile 8.0

AnnotationLoaderTest.php in vendor/symfony/validator/Tests/Mapping/Loader/AnnotationLoaderTest.php

CollectionTest.php in vendor/symfony/validator/Tests/Constraints/CollectionTest.php

CollectionValidatorTest.php in vendor/symfony/validator/Tests/Constraints/CollectionValidatorTest.php

LegacyExecutionContextTest.php in vendor/symfony/validator/Tests/LegacyExecutionContextTest.php

XmlFileLoaderTest.php in vendor/symfony/validator/Tests/Mapping/Loader/XmlFileLoaderTest.php

YamlFileLoaderTest.php in vendor/symfony/validator/Tests/Mapping/Loader/YamlFileLoaderTest.php