chore: bump chromium to 121.0.6104.0 (main) (#40418)

* chore: bump chromium in DEPS to 121.0.6101.0

* chore: update patches

* Explictly use python3 to check patch diff

* chore: bump chromium in DEPS to 121.0.6102.0

* chore: update patches

* 4995136: [extensions] Enable Extension Mojo messaging

4995136

* Bind the components interfaces to a RenderFrame

4985961
Also:
3986427: Create RendererHost mojom interface for Extensions | 3986427

* 4997024: Enum modernisation for resources_private.idl

4997024

* 4997025: Enum modernisation for scripting.idl

4997025

* chore: bump chromium in DEPS to 121.0.6103.0

* chore: update patches

* chore: bump chromium in DEPS to 121.0.6104.0

* chore: update patches

---------

Co-authored-by: electron-roller[bot] <84116207+electron-roller[bot]@users.noreply.github.com>
Co-authored-by: John Kleinschmidt <jkleinsc@electronjs.org>
Co-authored-by: PatchUp <73610968+patchup[bot]@users.noreply.github.com>

patches/chromium/revert_remove_the_allowaggressivethrottlingwithwebsocket_feature.patch

@@ -6,7 +6,7 @@ Subject: Revert "Remove the AllowAggressiveThrottlingWithWebSocket feature."
 This reverts commit 615c1810a187840ffeb04096087efff86edb37de.
 
 diff --git a/third_party/blink/renderer/modules/websockets/websocket_channel_impl.cc b/third_party/blink/renderer/modules/websockets/websocket_channel_impl.cc
-index f01370e63377722e9585e89d479100b87a448015..89fe8c569e7ddc2fad2076a33d3de743fb2fee52 100644
+index 086679f616c3211324e0bae05c71e2d1bc459cf3..4103594b79d7482568b4c3a366b3290ee0523c0d 100644
 --- a/third_party/blink/renderer/modules/websockets/websocket_channel_impl.cc
 +++ b/third_party/blink/renderer/modules/websockets/websocket_channel_impl.cc
 @@ -95,6 +95,17 @@ enum WebSocketOpCode {