Roll angle licenses (#11035)

Rolls ANGLE forward to pick up the fix for
https://bugs.chromium.org/p/angleproject/issues/detail?id=3811
which substantially reduces the number of ANGLE copyright variants.

Updates LICENSES accordingly.

DEPS

@@ -137,7 +137,7 @@ allowed_hosts = [
 ]
 
 deps = {
-  'src': 'https://github.com/flutter/buildroot.git' + '@' + '5a33d6ab06fa2cc94cdd864ff238d2c58d6b7e4e',
+  'src': 'https://github.com/flutter/buildroot.git' + '@' + 'dbb274c492734c27c6b3b760b70151f8cb0b6d2e',
 
    # Fuchsia compatibility
    #
@@ -420,7 +420,7 @@ deps = {
    Var('swiftshader_git') + '/SwiftShader.git' + '@' + 'd70129a3d3409dac58e14f819b62620393afb652',
 
    'src/third_party/angle':
-   Var('github_git') + '/google/angle.git' + '@' + '2d0a9acb05511a8fdaf0cd27d0da22599516a68b',
+   Var('github_git') + '/google/angle.git' + '@' + '3ea90d609720b7b9b9d05ca094860382f2425294',
 
   'src/third_party/pkg/when':
    Var('dart_git') + '/when.git' + '@' + '0.2.0',