18007 Set the max vulkan API version (cla: yes)

18009 Disable the import_internal_library analyzer check for dart:ui (cla: yes)

18014 use $CIRRUS_BASE_BRANCH for the branch name (cla: yes)

18015 skip TextSemanticsFocusTest for flake (cla: yes)

18017 Roll src/third_party/skia 4baa7326ccfb..a50ce3c98357 (18 commits) (cla: yes, waiting for tree to go green)

18018 Roll fuchsia/sdk/core/mac-amd64 from arZdZ… to 6VJ1C… (cla: yes, waiting for tree to go green)

18019 [web] also hide scrollbars in text_editing (cla: yes)