Update git submodules

* Update platform/external/swiftshader from branch 'master'
  to 4ded36f203e0f715ca9ee9cbb7054bc6a4db7ea1
  - Roll SwiftShader from c27e99245d42 to b3b1a3fe8351 (1 revision)
    
    https://swiftshader.googlesource.com/SwiftShader.git/+log/c27e99245d42..b3b1a3fe8351
    
    Please enable autosubmit on changes if possible when approving them.
    
    If this roll has caused a breakage, revert this CL and stop the roller
    using the controls here:
    https://autoroll.skia.org/r/swiftshader-android
    Please CC swiftshader-eng@google.com on the revert to ensure that a human
    is aware of the problem.
    
    To file a bug in SwiftShader: https://bugs.chromium.org/p/swiftshader/issues/entry
    
    To report a problem with the AutoRoller itself, please file a bug:
    https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug
    
    Documentation for the AutoRoller is here:
    https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
    
    Test: Presubmit checks will test this change.
    Exempt-From-Owner-Approval: The autoroll bot does not require owner approval.
    Change-Id: I8325a010e7a92100cc99272890fe779271ddf9de
    
  - Regres: Update test lists @ c27e9924
    
    Reactor backend: Subzero
    
    Change-Id: I592bbebde83973099427ba65a743fc343c0564a4
    Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/64208


    Kokoro-Result: kokoro <noreply+kokoro@google.com>
    Reviewed-by: Alexis Hétu <sugoi@google.com>
    Commit-Queue: Alexis Hétu <sugoi@google.com>
    Tested-by: Alexis Hétu <sugoi@google.com>