Roll Skia from e4e234d412ee to bb61c2b4614e (4 revisions) (flutter/engine#50736)

https://skia.googlesource.com/skia.git/+log/e4e234d412ee..bb61c2b4614e

2024-02-16 brianosman@google.com Return a luminance color from SkColor4Shader
2024-02-16 kjlubick@google.com Enforce IWYU on misc ganesh files
2024-02-16 skia-autoroll@skia-public.iam.gserviceaccount.com Roll vulkan-deps from 59c02c8da968 to a8bde474ad6e (5 revisions)
2024-02-16 bungeman@google.com [svg] Add offset adjustment once per line

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC brianosman@google.com,johnstiles@google.com,jsimmons@google.com,rmistry@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Skia: https://bugs.chromium.org/p/skia/issues/entry
To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

DEPS

@@ -14,7 +14,7 @@ vars = {
   'flutter_git': 'https://flutter.googlesource.com',
   'skia_git': 'https://skia.googlesource.com',
   'llvm_git': 'https://llvm.googlesource.com',
-  'skia_revision': 'e4e234d412eed1eb3e742450d32e25af1a8a9850',
+  'skia_revision': 'bb61c2b4614e048b0fac8a4c3389f9631807953e',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: d19c9c387cd0e12cfaedd2451362e00d
+Signature: 23ad9ac19ccf8eed4c2207328a3db033
 
 ====================================================================================================
 LIBRARY: etc1