Updated Drupal to 8.6. This goes with the following updates because it's possible...

[yaffs-website] / web / core / modules / config / tests / config_test / config / install / config_test.dynamic.isinstallable.yml

diff --git a/web/core/modules/config/tests/config_test/config/install/config_test.dynamic.isinstallable.default.yml b/web/core/modules/config/tests/config_test/config/install/config_test.dynamic.isinstallable.yml
similarity index 100%
rename from web/core/modules/config/tests/config_test/config/install/config_test.dynamic.isinstallable.default.yml
rename to web/core/modules/config/tests/config_test/config/install/config_test.dynamic.isinstallable.yml