27847 Roll Skia from 60f3e2a7d557 to 3bbecc3e9a2b (1 revision) (cla: yes, waiting for tree to go green)

27848 Roll Skia from 3bbecc3e9a2b to 82f5815629bf (1 revision) (cla: yes, waiting for tree to go green)

27850 Allow iOS unit tests to run on Xcode 13 (platform-ios, cla: yes, waiting for tree to go green)

27851 Explicitly provide the string encoding (cla: yes, waiting for tree to go green)

27852 Add lockfiles in the scenario app (cla: yes)

27853 Specify string encoding in git revision (cla: yes, waiting for tree to go green)