[deps] rev dartdoc, webdev

Revisions updated by `dart tools/rev_sdk_deps.dart`.

dartdoc (https://github.com/dart-lang/dartdoc/compare/1ae5b4c..d9e31ff):
  d9e31ff9  2024-04-22  Sam Rawlins  Extract Canonicalization from the ModelElement hierarchy (dart-lang/dartdoc#3753)

webdev (https://github.com/dart-lang/webdev/compare/d4f9f67..50bf268):
  50bf2687  2024-04-24  Elliott Brooks  Add `dwdsLaunch` and `dwdsAttach` events (dart-lang/webdev#2418)
  804eb5c5  2024-04-24  Elliott Brooks  Reset DWDS and WebDev after release (dart-lang/webdev#2419)
  988b03bf  2024-04-23  Elliott Brooks  Prepare webdev for release to version 3.5.0 (dart-lang/webdev#2417)
  68513c8f  2024-04-23  Elliott Brooks  Prepare DWDS for release to version 24.0.0 (dart-lang/webdev#2413)
  0b188169  2024-04-22  Elliott Brooks  Fix test timeouts related to weak null safety (dart-lang/webdev#2416)

Change-Id: Ie366c07cf46d7efb15d67322eac045e6a6bd7fe3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/364522
Auto-Submit: Devon Carew <[email protected]>
Reviewed-by: Konstantin Shcheglov <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>

DEPS

@@ -144,7 +144,7 @@ vars = {
   #
   # For more details, see https://github.com/dart-lang/sdk/issues/30164.
   "dart_style_rev": "a6ad7693555a9add6f98ad6fd94de80d35c89415", # disable tools/rev_sdk_deps.dart
-  "dartdoc_rev": "1ae5b4c0e8c63fb53df0540e42a709efb88d1af4",
+  "dartdoc_rev": "d9e31ff950c92350b464b859eaac272a97e15070",
   "ecosystem_rev": "9fabe464ea1d8408774de74d2ac759c1f90ae480",
   "file_rev": "f858c6fe9d1b0167b944aa62dd9b4321036b5238",
   "fixnum_rev": "dec16eb715f70f2fe0ed509da2e118354bea21d8",
@@ -193,7 +193,7 @@ vars = {
   "watcher_rev": "1bd2f20d0d924c8422aa2b9afdb165bff4f053c0",
   "web_rev": "9d8c802d13b785b1a5b201c4a43605d640841c98",
   "web_socket_channel_rev": "b612fc2caa9f4c3c8947b4ffbb274bce33c54a04",
-  "webdev_rev": "d4f9f6720e727c93781ec4425bc5f7a16ece33b0",
+  "webdev_rev": "50bf268794a4cb70b3a82d8177e55160ee4227df",
   "webdriver_rev": "c80e01e6ce121e55c31e33a31e5d3950023e6bc9",
   "webkit_inspection_protocol_rev": "153fea4fe5ac45bebf0c2e76bb3d76b0f1fcdaae",
   "yaml_rev": "5a1c4be2437bc4122ccf08a3a0f06a7683e62f30",