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

https://chromium-review.googlesource.com/c/chromium/src/+/4995136

* Bind the components interfaces to a RenderFrame

https://chromium-review.googlesource.com/c/chromium/src/+/4985961
Also:
3986427: Create RendererHost mojom interface for Extensions | https://chromium-review.googlesource.com/c/chromium/src/+/3986427

* 4997024: Enum modernisation for resources_private.idl

https://chromium-review.googlesource.com/c/chromium/src/+/4997024

* 4997025: Enum modernisation for scripting.idl

https://chromium-review.googlesource.com/c/chromium/src/+/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>

shell/common/extensions/api/resources_private.idl

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 // resourcesPrivate.
+[modernised_enums]
 namespace resourcesPrivate {
   enum Component { identity, pdf };
 

shell/common/extensions/api/scripting.idl

@@ -4,6 +4,7 @@
 
 // Use the <code>chrome.scripting</code> API to execute script in different
 // contexts.
+[modernised_enums]
 namespace scripting {
   callback InjectedFunction = void();